[bugfix] self-referencing collection pages for status replies (#2364)

23 files changed, 608 insertions, 424 deletions

diff --git a/internal/ap/activitystreams_test.go b/internal/ap/activitystreams_test.go
index ee03f9b0f..d769fa42f 100644
--- a/internal/ap/activitystreams_test.go
+++ b/internal/ap/activitystreams_test.go
@@ -49,6 +49,7 @@ func TestASCollection(t *testing.T) {
 	// Create new collection using builder function.
 	c := ap.NewASCollection(ap.CollectionParams{
 		ID:    parseURI(idURI),
+		Query: url.Values{"limit": []string{"40"}},
 		Total: total,
 	})
 
@@ -56,7 +57,7 @@ func TestASCollection(t *testing.T) {
 	s := toJSON(c)
 
 	// Ensure outputs are equal.
-	assert.Equal(t, s, expect)
+	assert.Equal(t, expect, s)
 }
 
 func TestASCollectionPage(t *testing.T) {
@@ -110,7 +111,7 @@ func TestASCollectionPage(t *testing.T) {
 	s := toJSON(p)
 
 	// Ensure outputs are equal.
-	assert.Equal(t, s, expect)
+	assert.Equal(t, expect, s)
 }
 
 func TestASOrderedCollection(t *testing.T) {
@@ -131,6 +132,7 @@ func TestASOrderedCollection(t *testing.T) {
 	// Create new collection using builder function.
 	c := ap.NewASOrderedCollection(ap.CollectionParams{
 		ID:    parseURI(idURI),
+		Query: url.Values{"limit": []string{"40"}},
 		Total: total,
 	})
 
@@ -138,7 +140,7 @@ func TestASOrderedCollection(t *testing.T) {
 	s := toJSON(c)
 
 	// Ensure outputs are equal.
-	assert.Equal(t, s, expect)
+	assert.Equal(t, expect, s)
 }
 
 func TestASOrderedCollectionPage(t *testing.T) {
@@ -192,7 +194,7 @@ func TestASOrderedCollectionPage(t *testing.T) {
 	s := toJSON(p)
 
 	// Ensure outputs are equal.
-	assert.Equal(t, s, expect)
+	assert.Equal(t, expect, s)
 }
 
 func parseURI(s string) *url.URL {
diff --git a/internal/ap/collections.go b/internal/ap/collections.go
index e86d989ff..ba3887a5b 100644
--- a/internal/ap/collections.go
+++ b/internal/ap/collections.go
@@ -20,7 +20,6 @@ package ap
 import (
 	"fmt"
 	"net/url"
-	"strconv"
 
 	"github.com/superseriousbusiness/activity/streams"
 	"github.com/superseriousbusiness/activity/streams/vocab"
@@ -169,6 +168,10 @@ type CollectionParams struct {
 	// ID (i.e. NOT the page).
 	ID *url.URL
 
+	// First page details.
+	First paging.Page
+	Query url.Values
+
 	// Total no. items.
 	Total int
 }
@@ -224,7 +227,7 @@ type ItemsPropertyBuilder interface {
 // NewASCollection builds and returns a new ActivityStreams Collection from given parameters.
 func NewASCollection(params CollectionParams) vocab.ActivityStreamsCollection {
 	collection := streams.NewActivityStreamsCollection()
-	buildCollection(collection, params, 40)
+	buildCollection(collection, params)
 	return collection
 }
 
@@ -239,7 +242,7 @@ func NewASCollectionPage(params CollectionPageParams) vocab.ActivityStreamsColle
 // NewASOrderedCollection builds and returns a new ActivityStreams OrderedCollection from given parameters.
 func NewASOrderedCollection(params CollectionParams) vocab.ActivityStreamsOrderedCollection {
 	collection := streams.NewActivityStreamsOrderedCollection()
-	buildCollection(collection, params, 40)
+	buildCollection(collection, params)
 	return collection
 }
 
@@ -251,7 +254,7 @@ func NewASOrderedCollectionPage(params CollectionPageParams) vocab.ActivityStrea
 	return collectionPage
 }
 
-func buildCollection[C CollectionBuilder](collection C, params CollectionParams, pageLimit int) {
+func buildCollection[C CollectionBuilder](collection C, params CollectionParams) {
 	// Add the collection ID property.
 	idProp := streams.NewJSONLDIdProperty()
 	idProp.SetIRI(params.ID)
@@ -262,15 +265,20 @@ func buildCollection[C CollectionBuilder](collection C, params CollectionParams,
 	totalItems.Set(params.Total)
 	collection.SetActivityStreamsTotalItems(totalItems)
 
-	// Clone the collection ID page
-	// to add first page query data.
-	firstIRI := new(url.URL)
-	*firstIRI = *params.ID
+	// Append paging query params
+	// to those already in ID prop.
+	pageQueryParams := appendQuery(
+		params.Query,
+		params.ID.Query(),
+	)
 
-	// Note that simply adding a limit signals to our
-	// endpoint to use paging (which will start at beginning).
-	limit := "limit=" + strconv.Itoa(pageLimit)
-	firstIRI.RawQuery = appendQuery(firstIRI.RawQuery, limit)
+	// Build the first page link IRI.
+	firstIRI := params.First.ToLinkURL(
+		params.ID.Scheme,
+		params.ID.Host,
+		params.ID.Path,
+		pageQueryParams,
+	)
 
 	// Add the collection first IRI property.
 	first := streams.NewActivityStreamsFirstProperty()
@@ -284,12 +292,19 @@ func buildCollectionPage[C CollectionPageBuilder, I ItemsPropertyBuilder](collec
 	partOfProp.SetIRI(params.ID)
 	collectionPage.SetActivityStreamsPartOf(partOfProp)
 
+	// Append paging query params
+	// to those already in ID prop.
+	pageQueryParams := appendQuery(
+		params.Query,
+		params.ID.Query(),
+	)
+
 	// Build the current page link IRI.
 	currentIRI := params.Current.ToLinkURL(
 		params.ID.Scheme,
 		params.ID.Host,
 		params.ID.Path,
-		params.Query,
+		pageQueryParams,
 	)
 
 	// Add the collection ID property for
@@ -303,7 +318,7 @@ func buildCollectionPage[C CollectionPageBuilder, I ItemsPropertyBuilder](collec
 		params.ID.Scheme,
 		params.ID.Host,
 		params.ID.Path,
-		params.Query,
+		pageQueryParams,
 	)
 
 	if nextIRI != nil {
@@ -318,7 +333,7 @@ func buildCollectionPage[C CollectionPageBuilder, I ItemsPropertyBuilder](collec
 		params.ID.Scheme,
 		params.ID.Host,
 		params.ID.Path,
-		params.Query,
+		pageQueryParams,
 	)
 
 	if prevIRI != nil {
@@ -349,11 +364,13 @@ func buildCollectionPage[C CollectionPageBuilder, I ItemsPropertyBuilder](collec
 	setItems(itemsProp)
 }
 
-// appendQuery appends part to an existing raw
-// query with ampersand, else just returning part.
-func appendQuery(raw, part string) string {
-	if raw != "" {
-		return raw + "&" + part
+// appendQuery appends query values in 'src' to 'dst', returning 'dst'.
+func appendQuery(dst, src url.Values) url.Values {
+	if dst == nil {
+		return src
+	}
+	for k, vs := range src {
+		dst[k] = append(dst[k], vs...)
 	}
-	return part
+	return dst
 }
diff --git a/internal/api/activitypub/users/repliesget.go b/internal/api/activitypub/users/repliesget.go
index fd9dc090b..3ac4ccbbb 100644
--- a/internal/api/activitypub/users/repliesget.go
+++ b/internal/api/activitypub/users/repliesget.go
@@ -20,14 +20,13 @@ package users
 import (
 	"encoding/json"
 	"errors"
-	"fmt"
 	"net/http"
-	"strconv"
 	"strings"
 
 	"github.com/gin-gonic/gin"
 	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/paging"
 )
 
 // StatusRepliesGETHandler swagger:operation GET /users/{username}/statuses/{status}/replies s2sRepliesGet
@@ -120,36 +119,43 @@ func (m *Module) StatusRepliesGETHandler(c *gin.Context) {
 		return
 	}
 
-	var page bool
-	if pageString := c.Query(PageKey); pageString != "" {
-		i, err := strconv.ParseBool(pageString)
-		if err != nil {
-			err := fmt.Errorf("error parsing %s: %s", PageKey, err)
-			apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
-			return
-		}
-		page = i
+	// Look for supplied 'only_other_accounts' query key.
+	onlyOtherAccounts, errWithCode := apiutil.ParseOnlyOtherAccounts(
+		c.Query(apiutil.OnlyOtherAccountsKey),
+		true, // default = enabled
+	)
+	if errWithCode != nil {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
 	}
 
-	onlyOtherAccounts := false
-	onlyOtherAccountsString := c.Query(OnlyOtherAccountsKey)
-	if onlyOtherAccountsString != "" {
-		i, err := strconv.ParseBool(onlyOtherAccountsString)
-		if err != nil {
-			err := fmt.Errorf("error parsing %s: %s", OnlyOtherAccountsKey, err)
-			apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
-			return
-		}
-		onlyOtherAccounts = i
+	// Look for given paging query parameters.
+	page, errWithCode := paging.ParseIDPage(c,
+		1,  // min limit
+		40, // max limit
+		0,  // default = disabled
+	)
+	if errWithCode != nil {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
+		return
 	}
 
-	minID := ""
-	minIDString := c.Query(MinIDKey)
-	if minIDString != "" {
-		minID = minIDString
+	// COMPATIBILITY FIX: 'page=true' enables paging.
+	if page == nil && c.Query("page") == "true" {
+		page = new(paging.Page)
+		page.Max = paging.MaxID("")
+		page.Min = paging.MinID("")
+		page.Limit = 20 // default
 	}
 
-	resp, errWithCode := m.processor.Fedi().StatusRepliesGet(c.Request.Context(), requestedUsername, requestedStatusID, page, onlyOtherAccounts, c.Query("only_other_accounts") != "", minID)
+	// Fetch serialized status replies response for input status.
+	resp, errWithCode := m.processor.Fedi().StatusRepliesGet(
+		c.Request.Context(),
+		requestedUsername,
+		requestedStatusID,
+		page,
+		onlyOtherAccounts,
+	)
 	if errWithCode != nil {
 		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return
@@ -157,7 +163,8 @@ func (m *Module) StatusRepliesGETHandler(c *gin.Context) {
 
 	b, err := json.Marshal(resp)
 	if err != nil {
-		apiutil.ErrorHandler(c, gtserror.NewErrorInternalError(err), m.processor.InstanceGetV1)
+		errWithCode := gtserror.NewErrorInternalError(err)
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
 		return
 	}
 
diff --git a/internal/api/activitypub/users/repliesget_test.go b/internal/api/activitypub/users/repliesget_test.go
index 26492d8ce..ac25f3617 100644
--- a/internal/api/activitypub/users/repliesget_test.go
+++ b/internal/api/activitypub/users/repliesget_test.go
@@ -18,10 +18,10 @@
 package users_test
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
-	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -31,6 +31,7 @@ import (
 	"github.com/stretchr/testify/suite"
 	"github.com/superseriousbusiness/activity/streams"
 	"github.com/superseriousbusiness/activity/streams/vocab"
+	"github.com/superseriousbusiness/gotosocial/internal/ap"
 	"github.com/superseriousbusiness/gotosocial/internal/api/activitypub/users"
 	"github.com/superseriousbusiness/gotosocial/testrig"
 )
@@ -49,7 +50,7 @@ func (suite *RepliesGetTestSuite) TestGetReplies() {
 	// setup request
 	recorder := httptest.NewRecorder()
 	ctx, _ := testrig.CreateGinTestContext(recorder, nil)
-	ctx.Request = httptest.NewRequest(http.MethodGet, targetStatus.URI+"/replies", nil) // the endpoint we're hitting
+	ctx.Request = httptest.NewRequest(http.MethodGet, targetStatus.URI+"/replies?only_other_accounts=false", nil) // the endpoint we're hitting
 	ctx.Request.Header.Set("accept", "application/activity+json")
 	ctx.Request.Header.Set("Signature", signedRequest.SignatureHeader)
 	ctx.Request.Header.Set("Date", signedRequest.DateHeader)
@@ -76,13 +77,26 @@ func (suite *RepliesGetTestSuite) TestGetReplies() {
 	// check response
 	suite.EqualValues(http.StatusOK, recorder.Code)
 
+	// Read response body.
 	result := recorder.Result()
 	defer result.Body.Close()
-	b, err := ioutil.ReadAll(result.Body)
+	b, err := io.ReadAll(result.Body)
 	assert.NoError(suite.T(), err)
-	assert.Equal(suite.T(), `{"@context":"https://www.w3.org/ns/activitystreams","first":{"id":"http://localhost:8080/users/the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY/replies?page=true","next":"http://localhost:8080/users/the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY/replies?only_other_accounts=false\u0026page=true","partOf":"http://localhost:8080/users/the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY/replies","type":"CollectionPage"},"id":"http://localhost:8080/users/the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY/replies","type":"Collection"}`, string(b))
 
-	// should be a Collection
+	// Indent JSON
+	// for readability.
+	b = indentJSON(b)
+
+	// Create JSON string of expected output.
+	expect := toJSON(map[string]any{
+		"@context":   "https://www.w3.org/ns/activitystreams",
+		"type":       "OrderedCollection",
+		"id":         targetStatus.URI + "/replies?only_other_accounts=false",
+		"first":      targetStatus.URI + "/replies?limit=20&only_other_accounts=false",
+		"totalItems": 1,
+	})
+	assert.Equal(suite.T(), expect, string(b))
+
 	m := make(map[string]interface{})
 	err = json.Unmarshal(b, &m)
 	assert.NoError(suite.T(), err)
@@ -90,7 +104,7 @@ func (suite *RepliesGetTestSuite) TestGetReplies() {
 	t, err := streams.ToType(context.Background(), m)
 	assert.NoError(suite.T(), err)
 
-	_, ok := t.(vocab.ActivityStreamsCollection)
+	_, ok := t.(vocab.ActivityStreamsOrderedCollection)
 	assert.True(suite.T(), ok)
 }
 
@@ -131,14 +145,29 @@ func (suite *RepliesGetTestSuite) TestGetRepliesNext() {
 	// check response
 	suite.EqualValues(http.StatusOK, recorder.Code)
 
+	// Read response body.
 	result := recorder.Result()
 	defer result.Body.Close()
-	b, err := ioutil.ReadAll(result.Body)
+	b, err := io.ReadAll(result.Body)
 	assert.NoError(suite.T(), err)
 
-	assert.Equal(suite.T(), `{"@context":"https://www.w3.org/ns/activitystreams","id":"http://localhost:8080/users/the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY/replies?page=true\u0026only_other_accounts=false","items":"http://localhost:8080/users/admin/statuses/01FF25D5Q0DH7CHD57CTRS6WK0","next":"http://localhost:8080/users/the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY/replies?only_other_accounts=false\u0026page=true\u0026min_id=01FF25D5Q0DH7CHD57CTRS6WK0","partOf":"http://localhost:8080/users/the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY/replies","type":"CollectionPage"}`, string(b))
+	// Indent JSON
+	// for readability.
+	b = indentJSON(b)
+
+	// Create JSON string of expected output.
+	expect := toJSON(map[string]any{
+		"@context":     "https://www.w3.org/ns/activitystreams",
+		"type":         "OrderedCollectionPage",
+		"id":           targetStatus.URI + "/replies?limit=20&only_other_accounts=false",
+		"partOf":       targetStatus.URI + "/replies?only_other_accounts=false",
+		"next":         "http://localhost:8080/users/the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY/replies?limit=20&min_id=01FF25D5Q0DH7CHD57CTRS6WK0&only_other_accounts=false",
+		"prev":         "http://localhost:8080/users/the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY/replies?limit=20&max_id=01FF25D5Q0DH7CHD57CTRS6WK0&only_other_accounts=false",
+		"orderedItems": "http://localhost:8080/users/admin/statuses/01FF25D5Q0DH7CHD57CTRS6WK0",
+		"totalItems":   1,
+	})
+	assert.Equal(suite.T(), expect, string(b))
 
-	// should be a Collection
 	m := make(map[string]interface{})
 	err = json.Unmarshal(b, &m)
 	assert.NoError(suite.T(), err)
@@ -146,10 +175,10 @@ func (suite *RepliesGetTestSuite) TestGetRepliesNext() {
 	t, err := streams.ToType(context.Background(), m)
 	assert.NoError(suite.T(), err)
 
-	page, ok := t.(vocab.ActivityStreamsCollectionPage)
+	page, ok := t.(vocab.ActivityStreamsOrderedCollectionPage)
 	assert.True(suite.T(), ok)
 
-	assert.Equal(suite.T(), page.GetActivityStreamsItems().Len(), 1)
+	assert.Equal(suite.T(), page.GetActivityStreamsOrderedItems().Len(), 1)
 }
 
 func (suite *RepliesGetTestSuite) TestGetRepliesLast() {
@@ -162,7 +191,7 @@ func (suite *RepliesGetTestSuite) TestGetRepliesLast() {
 	// setup request
 	recorder := httptest.NewRecorder()
 	ctx, _ := testrig.CreateGinTestContext(recorder, nil)
-	ctx.Request = httptest.NewRequest(http.MethodGet, targetStatus.URI+"/replies?only_other_accounts=false&page=true&min_id=01FF25D5Q0DH7CHD57CTRS6WK0", nil) // the endpoint we're hitting
+	ctx.Request = httptest.NewRequest(http.MethodGet, targetStatus.URI+"/replies?min_id=01FF25D5Q0DH7CHD57CTRS6WK0&only_other_accounts=false", nil)
 	ctx.Request.Header.Set("accept", "application/activity+json")
 	ctx.Request.Header.Set("Signature", signedRequest.SignatureHeader)
 	ctx.Request.Header.Set("Date", signedRequest.DateHeader)
@@ -189,15 +218,27 @@ func (suite *RepliesGetTestSuite) TestGetRepliesLast() {
 	// check response
 	suite.EqualValues(http.StatusOK, recorder.Code)
 
+	// Read response body.
 	result := recorder.Result()
 	defer result.Body.Close()
-	b, err := ioutil.ReadAll(result.Body)
+	b, err := io.ReadAll(result.Body)
 	assert.NoError(suite.T(), err)
 
-	fmt.Println(string(b))
-	assert.Equal(suite.T(), `{"@context":"https://www.w3.org/ns/activitystreams","id":"http://localhost:8080/users/the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY/replies?page=true\u0026only_other_accounts=false\u0026min_id=01FF25D5Q0DH7CHD57CTRS6WK0","items":[],"next":"http://localhost:8080/users/the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY/replies?only_other_accounts=false\u0026page=true","partOf":"http://localhost:8080/users/the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY/replies","type":"CollectionPage"}`, string(b))
+	// Indent JSON
+	// for readability.
+	b = indentJSON(b)
+
+	// Create JSON string of expected output.
+	expect := toJSON(map[string]any{
+		"@context":     "https://www.w3.org/ns/activitystreams",
+		"type":         "OrderedCollectionPage",
+		"id":           targetStatus.URI + "/replies?min_id=01FF25D5Q0DH7CHD57CTRS6WK0&only_other_accounts=false",
+		"partOf":       targetStatus.URI + "/replies?only_other_accounts=false",
+		"orderedItems": []any{}, // empty
+		"totalItems":   1,
+	})
+	assert.Equal(suite.T(), expect, string(b))
 
-	// should be a Collection
 	m := make(map[string]interface{})
 	err = json.Unmarshal(b, &m)
 	assert.NoError(suite.T(), err)
@@ -205,12 +246,39 @@ func (suite *RepliesGetTestSuite) TestGetRepliesLast() {
 	t, err := streams.ToType(context.Background(), m)
 	assert.NoError(suite.T(), err)
 
-	page, ok := t.(vocab.ActivityStreamsCollectionPage)
+	page, ok := t.(vocab.ActivityStreamsOrderedCollectionPage)
 	assert.True(suite.T(), ok)
 
-	assert.Equal(suite.T(), page.GetActivityStreamsItems().Len(), 0)
+	assert.Equal(suite.T(), page.GetActivityStreamsOrderedItems().Len(), 0)
 }
 
 func TestRepliesGetTestSuite(t *testing.T) {
 	suite.Run(t, new(RepliesGetTestSuite))
 }
+
+// toJSON will return indented JSON serialized form of 'a'.
+func toJSON(a any) string {
+	v, ok := a.(vocab.Type)
+	if ok {
+		m, err := ap.Serialize(v)
+		if err != nil {
+			panic(err)
+		}
+		a = m
+	}
+	b, err := json.MarshalIndent(a, "", "  ")
+	if err != nil {
+		panic(err)
+	}
+	return string(b)
+}
+
+// indentJSON will return indented JSON from raw provided JSON.
+func indentJSON(b []byte) []byte {
+	var dst bytes.Buffer
+	err := json.Indent(&dst, b, "", "  ")
+	if err != nil {
+		panic(err)
+	}
+	return dst.Bytes()
+}
diff --git a/internal/api/util/parsequery.go b/internal/api/util/parsequery.go
index 6a9116dcf..da6320b67 100644
--- a/internal/api/util/parsequery.go
+++ b/internal/api/util/parsequery.go
@@ -41,6 +41,10 @@ const (
 	SinceIDKey = "since_id"
 	MinIDKey   = "min_id"
 
+	/* AP endpoint keys */
+
+	OnlyOtherAccountsKey = "only_other_accounts"
+
 	/* Search keys */
 
 	SearchExcludeUnreviewedKey = "exclude_unreviewed"
@@ -66,20 +70,6 @@ const (
 	DomainPermissionImportKey = "import"
 )
 
-// parseError returns gtserror.WithCode set to 400 Bad Request, to indicate
-// to the caller that a key was set to a value that could not be parsed.
-func parseError(key string, value, defaultValue any, err error) gtserror.WithCode {
-	err = fmt.Errorf("error parsing key %s with value %s as %T: %w", key, value, defaultValue, err)
-	return gtserror.NewErrorBadRequest(err, err.Error())
-}
-
-// requiredError returns gtserror.WithCode set to 400 Bad Request, to indicate
-// to the caller a required key value was not provided, or was empty.
-func requiredError(key string) gtserror.WithCode {
-	err := fmt.Errorf("required key %s was not set or had empty value", key)
-	return gtserror.NewErrorBadRequest(err, err.Error())
-}
-
 /*
 	Parse functions for *OPTIONAL* parameters with default values.
 */
@@ -129,6 +119,10 @@ func ParseDomainPermissionImport(value string, defaultValue bool) (bool, gtserro
 	return parseBool(value, defaultValue, DomainPermissionImportKey)
 }
 
+func ParseOnlyOtherAccounts(value string, defaultValue bool) (bool, gtserror.WithCode) {
+	return parseBool(value, defaultValue, OnlyOtherAccountsKey)
+}
+
 /*
 	Parse functions for *REQUIRED* parameters.
 */
@@ -248,3 +242,17 @@ func parseInt(value string, defaultValue int, max int, min int, key string) (int
 
 	return i, nil
 }
+
+// parseError returns gtserror.WithCode set to 400 Bad Request, to indicate
+// to the caller that a key was set to a value that could not be parsed.
+func parseError(key string, value, defaultValue any, err error) gtserror.WithCode {
+	err = fmt.Errorf("error parsing key %s with value %s as %T: %w", key, value, defaultValue, err)
+	return gtserror.NewErrorBadRequest(err, err.Error())
+}
+
+// requiredError returns gtserror.WithCode set to 400 Bad Request, to indicate
+// to the caller a required key value was not provided, or was empty.
+func requiredError(key string) gtserror.WithCode {
+	err := fmt.Errorf("required key %s was not set or had empty value", key)
+	return gtserror.NewErrorBadRequest(err, err.Error())
+}
diff --git a/internal/db/bundb/status.go b/internal/db/bundb/status.go
index 80346412c..dd161e1ec 100644
--- a/internal/db/bundb/status.go
+++ b/internal/db/bundb/status.go
@@ -18,7 +18,6 @@
 package bundb
 
 import (
-	"container/list"
 	"context"
 	"errors"
 	"time"
@@ -515,16 +514,7 @@ func (s *statusDB) GetStatusesUsingEmoji(ctx context.Context, emojiID string) ([
 	return s.GetStatusesByIDs(ctx, statusIDs)
 }
 
-func (s *statusDB) GetStatusParents(ctx context.Context, status *gtsmodel.Status, onlyDirect bool) ([]*gtsmodel.Status, error) {
-	if onlyDirect {
-		// Only want the direct parent, no further than first level
-		parent, err := s.GetStatusByID(ctx, status.InReplyToID)
-		if err != nil {
-			return nil, err
-		}
-		return []*gtsmodel.Status{parent}, nil
-	}
-
+func (s *statusDB) GetStatusParents(ctx context.Context, status *gtsmodel.Status) ([]*gtsmodel.Status, error) {
 	var parents []*gtsmodel.Status
 
 	for id := status.InReplyToID; id != ""; {
@@ -533,7 +523,7 @@ func (s *statusDB) GetStatusParents(ctx context.Context, status *gtsmodel.Status
 			return nil, err
 		}
 
-		// Append parent to slice
+		// Append parent status to slice
 		parents = append(parents, parent)
 
 		// Set the next parent ID
@@ -543,65 +533,31 @@ func (s *statusDB) GetStatusParents(ctx context.Context, status *gtsmodel.Status
 	return parents, nil
 }
 
-func (s *statusDB) GetStatusChildren(ctx context.Context, status *gtsmodel.Status, onlyDirect bool, minID string) ([]*gtsmodel.Status, error) {
-	foundStatuses := &list.List{}
-	foundStatuses.PushFront(status)
-	s.statusChildren(ctx, status, foundStatuses, onlyDirect, minID)
-
-	children := []*gtsmodel.Status{}
-	for e := foundStatuses.Front(); e != nil; e = e.Next() {
-		// only append children, not the overall parent status
-		entry, ok := e.Value.(*gtsmodel.Status)
-		if !ok {
-			log.Panic(ctx, "found status could not be asserted to *gtsmodel.Status")
-		}
-
-		if entry.ID != status.ID {
-			children = append(children, entry)
-		}
+func (s *statusDB) GetStatusChildren(ctx context.Context, statusID string) ([]*gtsmodel.Status, error) {
+	// Get all replies for the currently set status.
+	replies, err := s.GetStatusReplies(ctx, statusID)
+	if err != nil {
+		return nil, err
 	}
 
-	return children, nil
-}
+	// Make estimated preallocation based on direct replies.
+	children := make([]*gtsmodel.Status, 0, len(replies)*2)
 
-func (s *statusDB) statusChildren(ctx context.Context, status *gtsmodel.Status, foundStatuses *list.List, onlyDirect bool, minID string) {
-	childIDs, err := s.getStatusReplyIDs(ctx, status.ID)
-	if err != nil && !errors.Is(err, db.ErrNoEntries) {
-		log.Errorf(ctx, "error getting status %s children: %v", status.ID, err)
-		return
-	}
+	for _, status := range replies {
+		// Append status to children.
+		children = append(children, status)
 
-	for _, id := range childIDs {
-		if id <= minID {
-			continue
-		}
-
-		// Fetch child with ID from database
-		child, err := s.GetStatusByID(ctx, id)
+		// Further, recursively get all children for this reply.
+		grandChildren, err := s.GetStatusChildren(ctx, status.ID)
 		if err != nil {
-			log.Errorf(ctx, "error getting child status %q: %v", id, err)
-			continue
-		}
-
-	insertLoop:
-		for e := foundStatuses.Front(); e != nil; e = e.Next() {
-			entry, ok := e.Value.(*gtsmodel.Status)
-			if !ok {
-				log.Panic(ctx, "found status could not be asserted to *gtsmodel.Status")
-			}
-
-			if child.InReplyToAccountID != "" && entry.ID == child.InReplyToID {
-				foundStatuses.InsertAfter(child, e)
-				break insertLoop
-			}
+			return nil, err
 		}
 
-		// if we're not only looking for direct children of status, then do the same children-finding
-		// operation for the found child status too.
-		if !onlyDirect {
-			s.statusChildren(ctx, child, foundStatuses, false, minID)
-		}
+		// Append all sub children after status.
+		children = append(children, grandChildren...)
 	}
+
+	return children, nil
 }
 
 func (s *statusDB) GetStatusReplies(ctx context.Context, statusID string) ([]*gtsmodel.Status, error) {
diff --git a/internal/db/bundb/status_test.go b/internal/db/bundb/status_test.go
index a69608796..c0ff6c0da 100644
--- a/internal/db/bundb/status_test.go
+++ b/internal/db/bundb/status_test.go
@@ -163,9 +163,21 @@ func (suite *StatusTestSuite) TestGetStatusTwice() {
 	suite.Less(duration2, duration1)
 }
 
+func (suite *StatusTestSuite) TestGetStatusReplies() {
+	targetStatus := suite.testStatuses["local_account_1_status_1"]
+	children, err := suite.db.GetStatusReplies(context.Background(), targetStatus.ID)
+	suite.NoError(err)
+	suite.Len(children, 2)
+	for _, c := range children {
+		suite.Equal(targetStatus.URI, c.InReplyToURI)
+		suite.Equal(targetStatus.AccountID, c.InReplyToAccountID)
+		suite.Equal(targetStatus.ID, c.InReplyToID)
+	}
+}
+
 func (suite *StatusTestSuite) TestGetStatusChildren() {
 	targetStatus := suite.testStatuses["local_account_1_status_1"]
-	children, err := suite.db.GetStatusChildren(context.Background(), targetStatus, true, "")
+	children, err := suite.db.GetStatusChildren(context.Background(), targetStatus.ID)
 	suite.NoError(err)
 	suite.Len(children, 2)
 	for _, c := range children {
diff --git a/internal/db/bundb/util.go b/internal/db/bundb/util.go
index 1d820d081..a2bc87b88 100644
--- a/internal/db/bundb/util.go
+++ b/internal/db/bundb/util.go
@@ -18,6 +18,7 @@
 package bundb
 
 import (
+	"slices"
 	"strings"
 
 	"github.com/superseriousbusiness/gotosocial/internal/cache"
@@ -99,7 +100,7 @@ func loadPagedIDs(cache *cache.SliceCache[string], key string, page *paging.Page
 	// order. Depending on the paging requested
 	// this may be an unexpected order.
 	if page.GetOrder().Ascending() {
-		ids = paging.Reverse(ids)
+		slices.Reverse(ids)
 	}
 
 	// Page the resulting IDs.
diff --git a/internal/db/status.go b/internal/db/status.go
index 0be37421a..1ebf503a8 100644
--- a/internal/db/status.go
+++ b/internal/db/status.go
@@ -55,7 +55,7 @@ type Status interface {
 	// GetStatusesUsingEmoji fetches all status models using emoji with given ID stored in their 'emojis' column.
 	GetStatusesUsingEmoji(ctx context.Context, emojiID string) ([]*gtsmodel.Status, error)
 
-	// GetStatusReplies returns the *direct* (i.e. in_reply_to_id column) replies to this status ID.
+	// GetStatusReplies returns the *direct* (i.e. in_reply_to_id column) replies to this status ID, ordered DESC by ID.
 	GetStatusReplies(ctx context.Context, statusID string) ([]*gtsmodel.Status, error)
 
 	// CountStatusReplies returns the number of stored *direct* (i.e. in_reply_to_id column) replies to this status ID.
@@ -71,14 +71,10 @@ type Status interface {
 	IsStatusBoostedBy(ctx context.Context, statusID string, accountID string) (bool, error)
 
 	// GetStatusParents gets the parent statuses of a given status.
-	//
-	// If onlyDirect is true, only the immediate parent will be returned.
-	GetStatusParents(ctx context.Context, status *gtsmodel.Status, onlyDirect bool) ([]*gtsmodel.Status, error)
+	GetStatusParents(ctx context.Context, status *gtsmodel.Status) ([]*gtsmodel.Status, error)
 
 	// GetStatusChildren gets the child statuses of a given status.
-	//
-	// If onlyDirect is true, only the immediate children will be returned.
-	GetStatusChildren(ctx context.Context, status *gtsmodel.Status, onlyDirect bool, minID string) ([]*gtsmodel.Status, error)
+	GetStatusChildren(ctx context.Context, statusID string) ([]*gtsmodel.Status, error)
 
 	// IsStatusBookmarkedBy checks if a given status has been bookmarked by a given account ID
 	IsStatusBookmarkedBy(ctx context.Context, status *gtsmodel.Status, accountID string) (bool, error)
diff --git a/internal/paging/boundary.go b/internal/paging/boundary.go
index 15af65e0c..83d265515 100644
--- a/internal/paging/boundary.go
+++ b/internal/paging/boundary.go
@@ -131,3 +131,20 @@ func (b Boundary) Find(in []string) int {
 	}
 	return -1
 }
+
+// Boundary_FindFunc is functionally equivalent to Boundary{}.Find() but for an arbitrary type with ID.
+// Note: this is not a Boundary{} method as Go generics are not supported in method receiver functions.
+func Boundary_FindFunc[T any](b Boundary, in []T, get func(T) string) int { //nolint:revive
+	if get == nil {
+		panic("nil function")
+	}
+	if b.Value == "" {
+		return -1
+	}
+	for i := range in {
+		if get(in[i]) == b.Value {
+			return i
+		}
+	}
+	return -1
+}
diff --git a/internal/paging/page.go b/internal/paging/page.go
index a56f674dd..a1cf76c74 100644
--- a/internal/paging/page.go
+++ b/internal/paging/page.go
@@ -19,9 +19,8 @@ package paging
 
 import (
 	"net/url"
+	"slices"
 	"strconv"
-
-	"golang.org/x/exp/slices"
 )
 
 type Page struct {
@@ -117,7 +116,7 @@ func (p *Page) Page(in []string) []string {
 
 			// Output slice must
 			// ALWAYS be descending.
-			in = Reverse(in)
+			slices.Reverse(in)
 		}
 	} else {
 		// Default sort is descending,
@@ -143,6 +142,66 @@ func (p *Page) Page(in []string) []string {
 	return in
 }
 
+// Page_PageFunc is functionally equivalent to Page{}.Page(), but for an arbitrary type with ID.
+// Note: this is not a Page{} method as Go generics are not supported in method receiver functions.
+func Page_PageFunc[WithID any](p *Page, in []WithID, get func(WithID) string) []WithID { //nolint:revive
+	if p == nil {
+		// no paging.
+		return in
+	}
+
+	if p.order().Ascending() {
+		// Sort type is ascending, input
+		// data is assumed to be ascending.
+
+		if minIdx := Boundary_FindFunc(p.Min, in, get); minIdx != -1 {
+			// Reslice skipping up to min.
+			in = in[minIdx+1:]
+		}
+
+		if maxIdx := Boundary_FindFunc(p.Max, in, get); maxIdx != -1 {
+			// Reslice stripping past max.
+			in = in[:maxIdx]
+		}
+
+		if p.Limit > 0 && p.Limit < len(in) {
+			// Reslice input to limit.
+			in = in[:p.Limit]
+		}
+
+		if len(in) > 1 {
+			// Clone input before
+			// any modifications.
+			in = slices.Clone(in)
+
+			// Output slice must
+			// ALWAYS be descending.
+			slices.Reverse(in)
+		}
+	} else {
+		// Default sort is descending,
+		// catching all cases when NOT
+		// ascending (even zero value).
+
+		if maxIdx := Boundary_FindFunc(p.Max, in, get); maxIdx != -1 {
+			// Reslice skipping up to max.
+			in = in[maxIdx+1:]
+		}
+
+		if minIdx := Boundary_FindFunc(p.Min, in, get); minIdx != -1 {
+			// Reslice stripping past min.
+			in = in[:minIdx]
+		}
+
+		if p.Limit > 0 && p.Limit < len(in) {
+			// Reslice input to limit.
+			in = in[:p.Limit]
+		}
+	}
+
+	return in
+}
+
 // Next creates a new instance for the next returnable page, using
 // given max value. This preserves original limit and max key name.
 func (p *Page) Next(lo, hi string) *Page {
@@ -225,21 +284,24 @@ func (p *Page) ToLinkURL(proto, host, path string, queryParams url.Values) *url.
 	if queryParams == nil {
 		// Allocate new query parameters.
 		queryParams = make(url.Values)
+	} else {
+		// Before edit clone existing params.
+		queryParams = cloneQuery(queryParams)
 	}
 
 	if p.Min.Value != "" {
 		// A page-minimum query parameter is available.
-		queryParams.Add(p.Min.Name, p.Min.Value)
+		queryParams.Set(p.Min.Name, p.Min.Value)
 	}
 
 	if p.Max.Value != "" {
 		// A page-maximum query parameter is available.
-		queryParams.Add(p.Max.Name, p.Max.Value)
+		queryParams.Set(p.Max.Name, p.Max.Value)
 	}
 
 	if p.Limit > 0 {
 		// A page limit query parameter is available.
-		queryParams.Add("limit", strconv.Itoa(p.Limit))
+		queryParams.Set("limit", strconv.Itoa(p.Limit))
 	}
 
 	// Build URL string.
@@ -250,3 +312,12 @@ func (p *Page) ToLinkURL(proto, host, path string, queryParams url.Values) *url.
 		RawQuery: queryParams.Encode(),
 	}
 }
+
+// cloneQuery clones input map of url values.
+func cloneQuery(src url.Values) url.Values {
+	dst := make(url.Values, len(src))
+	for k, vs := range src {
+		dst[k] = slices.Clone(vs)
+	}
+	return dst
+}
diff --git a/internal/paging/page_test.go b/internal/paging/page_test.go
index 9eeb90882..3046dfcdd 100644
--- a/internal/paging/page_test.go
+++ b/internal/paging/page_test.go
@@ -19,12 +19,12 @@ package paging_test
 
 import (
 	"math/rand"
+	"slices"
 	"testing"
 	"time"
 
 	"github.com/oklog/ulid"
 	"github.com/superseriousbusiness/gotosocial/internal/paging"
-	"golang.org/x/exp/slices"
 )
 
 // random reader according to current-time source seed.
@@ -77,9 +77,7 @@ func TestPage(t *testing.T) {
 var cases = []Case{
 	CreateCase("minID and maxID set", func(ids []string) ([]string, *paging.Page, []string) {
 		// Ensure input slice sorted ascending for min_id
-		slices.SortFunc(ids, func(a, b string) bool {
-			return a > b // i.e. largest at lowest idx
-		})
+		slices.SortFunc(ids, ascending)
 
 		// Select random indices in slice.
 		minIdx := randRd.Intn(len(ids))
@@ -93,7 +91,7 @@ var cases = []Case{
 		expect := slices.Clone(ids)
 		expect = cutLower(expect, minID)
 		expect = cutUpper(expect, maxID)
-		expect = paging.Reverse(expect)
+		slices.Reverse(expect)
 
 		// Return page and expected IDs.
 		return ids, &paging.Page{
@@ -103,9 +101,7 @@ var cases = []Case{
 	}),
 	CreateCase("minID, maxID and limit set", func(ids []string) ([]string, *paging.Page, []string) {
 		// Ensure input slice sorted ascending for min_id
-		slices.SortFunc(ids, func(a, b string) bool {
-			return a > b // i.e. largest at lowest idx
-		})
+		slices.SortFunc(ids, ascending)
 
 		// Select random parameters in slice.
 		minIdx := randRd.Intn(len(ids))
@@ -120,7 +116,7 @@ var cases = []Case{
 		expect := slices.Clone(ids)
 		expect = cutLower(expect, minID)
 		expect = cutUpper(expect, maxID)
-		expect = paging.Reverse(expect)
+		slices.Reverse(expect)
 
 		// Now limit the slice.
 		if limit < len(expect) {
@@ -136,9 +132,7 @@ var cases = []Case{
 	}),
 	CreateCase("minID, maxID and too-large limit set", func(ids []string) ([]string, *paging.Page, []string) {
 		// Ensure input slice sorted ascending for min_id
-		slices.SortFunc(ids, func(a, b string) bool {
-			return a > b // i.e. largest at lowest idx
-		})
+		slices.SortFunc(ids, ascending)
 
 		// Select random parameters in slice.
 		minIdx := randRd.Intn(len(ids))
@@ -152,7 +146,7 @@ var cases = []Case{
 		expect := slices.Clone(ids)
 		expect = cutLower(expect, minID)
 		expect = cutUpper(expect, maxID)
-		expect = paging.Reverse(expect)
+		slices.Reverse(expect)
 
 		// Return page and expected IDs.
 		return ids, &paging.Page{
@@ -163,9 +157,7 @@ var cases = []Case{
 	}),
 	CreateCase("sinceID and maxID set", func(ids []string) ([]string, *paging.Page, []string) {
 		// Ensure input slice sorted descending for since_id
-		slices.SortFunc(ids, func(a, b string) bool {
-			return a < b // i.e. smallest at lowest idx
-		})
+		slices.SortFunc(ids, descending)
 
 		// Select random indices in slice.
 		sinceIdx := randRd.Intn(len(ids))
@@ -188,9 +180,7 @@ var cases = []Case{
 	}),
 	CreateCase("maxID set", func(ids []string) ([]string, *paging.Page, []string) {
 		// Ensure input slice sorted descending for max_id
-		slices.SortFunc(ids, func(a, b string) bool {
-			return a < b // i.e. smallest at lowest idx
-		})
+		slices.SortFunc(ids, descending)
 
 		// Select random indices in slice.
 		maxIdx := randRd.Intn(len(ids))
@@ -209,9 +199,7 @@ var cases = []Case{
 	}),
 	CreateCase("sinceID set", func(ids []string) ([]string, *paging.Page, []string) {
 		// Ensure input slice sorted descending for since_id
-		slices.SortFunc(ids, func(a, b string) bool {
-			return a < b
-		})
+		slices.SortFunc(ids, descending)
 
 		// Select random indices in slice.
 		sinceIdx := randRd.Intn(len(ids))
@@ -230,9 +218,7 @@ var cases = []Case{
 	}),
 	CreateCase("minID set", func(ids []string) ([]string, *paging.Page, []string) {
 		// Ensure input slice sorted ascending for min_id
-		slices.SortFunc(ids, func(a, b string) bool {
-			return a > b // i.e. largest at lowest idx
-		})
+		slices.SortFunc(ids, ascending)
 
 		// Select random indices in slice.
 		minIdx := randRd.Intn(len(ids))
@@ -243,7 +229,7 @@ var cases = []Case{
 		// Create expected output.
 		expect := slices.Clone(ids)
 		expect = cutLower(expect, minID)
-		expect = paging.Reverse(expect)
+		slices.Reverse(expect)
 
 		// Return page and expected IDs.
 		return ids, &paging.Page{
@@ -296,3 +282,21 @@ func generateSlice(len int) []string {
 	}
 	return in
 }
+
+func ascending(a, b string) int {
+	if a > b {
+		return 1
+	} else if a < b {
+		return -1
+	}
+	return 0
+}
+
+func descending(a, b string) int {
+	if a < b {
+		return 1
+	} else if a > b {
+		return -1
+	}
+	return 0
+}
diff --git a/internal/paging/util.go b/internal/paging/util.go
deleted file mode 100644
index dd941dd88..000000000
--- a/internal/paging/util.go
+++ /dev/null
@@ -1,43 +0,0 @@
-// GoToSocial
-// Copyright (C) GoToSocial Authors admin@gotosocial.org
-// SPDX-License-Identifier: AGPL-3.0-or-later
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package paging
-
-// Reverse will reverse the given input slice.
-func Reverse(in []string) []string {
-	var (
-		// Start at front.
-		i = 0
-
-		// Start at back.
-		j = len(in) - 1
-	)
-
-	for i < j {
-		// Swap i,j index values in slice.
-		in[i], in[j] = in[j], in[i]
-
-		// incr + decr,
-		// looping until
-		// they meet in
-		// the middle.
-		i++
-		j--
-	}
-
-	return in
-}
diff --git a/internal/processing/fedi/collections.go b/internal/processing/fedi/collections.go
index cbabbfdd6..ccca10754 100644
--- a/internal/processing/fedi/collections.go
+++ b/internal/processing/fedi/collections.go
@@ -47,8 +47,15 @@ func (p *Processor) InboxPost(ctx context.Context, w http.ResponseWriter, r *htt
 
 // OutboxGet returns the activitypub representation of a local user's outbox.
 // This contains links to PUBLIC posts made by this user.
-func (p *Processor) OutboxGet(ctx context.Context, requestedUsername string, page bool, maxID string, minID string) (interface{}, gtserror.WithCode) {
-	requestedAccount, _, errWithCode := p.authenticate(ctx, requestedUsername)
+func (p *Processor) OutboxGet(
+	ctx context.Context,
+	requestedUser string,
+	page bool,
+	maxID string,
+	minID string,
+) (interface{}, gtserror.WithCode) {
+	// Authenticate the incoming request, getting related user accounts.
+	_, receiver, errWithCode := p.authenticate(ctx, requestedUser)
 	if errWithCode != nil {
 		return nil, errWithCode
 	}
@@ -70,7 +77,7 @@ func (p *Processor) OutboxGet(ctx context.Context, requestedUsername string, pag
 				"last": "https://example.org/users/whatever/outbox?min_id=0&page=true"
 			}
 		*/
-		collection, err := p.converter.OutboxToASCollection(ctx, requestedAccount.OutboxURI)
+		collection, err := p.converter.OutboxToASCollection(ctx, receiver.OutboxURI)
 		if err != nil {
 			return nil, gtserror.NewErrorInternalError(err)
 		}
@@ -85,15 +92,16 @@ func (p *Processor) OutboxGet(ctx context.Context, requestedUsername string, pag
 
 	// scenario 2 -- get the requested page
 	// limit pages to 30 entries per page
-	publicStatuses, err := p.state.DB.GetAccountStatuses(ctx, requestedAccount.ID, 30, true, true, maxID, minID, false, true)
+	publicStatuses, err := p.state.DB.GetAccountStatuses(ctx, receiver.ID, 30, true, true, maxID, minID, false, true)
 	if err != nil && !errors.Is(err, db.ErrNoEntries) {
 		return nil, gtserror.NewErrorInternalError(err)
 	}
 
-	outboxPage, err := p.converter.StatusesToASOutboxPage(ctx, requestedAccount.OutboxURI, maxID, minID, publicStatuses)
+	outboxPage, err := p.converter.StatusesToASOutboxPage(ctx, receiver.OutboxURI, maxID, minID, publicStatuses)
 	if err != nil {
 		return nil, gtserror.NewErrorInternalError(err)
 	}
+
 	data, err = ap.Serialize(outboxPage)
 	if err != nil {
 		return nil, gtserror.NewErrorInternalError(err)
@@ -104,21 +112,22 @@ func (p *Processor) OutboxGet(ctx context.Context, requestedUsername string, pag
 
 // FollowersGet handles the getting of a fedi/activitypub representation of a user/account's followers, performing appropriate
 // authentication before returning a JSON serializable interface to the caller.
-func (p *Processor) FollowersGet(ctx context.Context, requestedUsername string, page *paging.Page) (interface{}, gtserror.WithCode) {
-	requestedAccount, _, errWithCode := p.authenticate(ctx, requestedUsername)
+func (p *Processor) FollowersGet(ctx context.Context, requestedUser string, page *paging.Page) (interface{}, gtserror.WithCode) {
+	// Authenticate the incoming request, getting related user accounts.
+	_, receiver, errWithCode := p.authenticate(ctx, requestedUser)
 	if errWithCode != nil {
 		return nil, errWithCode
 	}
 
 	// Parse the collection ID object from account's followers URI.
-	collectionID, err := url.Parse(requestedAccount.FollowersURI)
+	collectionID, err := url.Parse(receiver.FollowersURI)
 	if err != nil {
-		err := gtserror.Newf("error parsing account followers uri %s: %w", requestedAccount.FollowersURI, err)
+		err := gtserror.Newf("error parsing account followers uri %s: %w", receiver.FollowersURI, err)
 		return nil, gtserror.NewErrorInternalError(err)
 	}
 
 	// Calculate total number of followers available for account.
-	total, err := p.state.DB.CountAccountFollowers(ctx, requestedAccount.ID)
+	total, err := p.state.DB.CountAccountFollowers(ctx, receiver.ID)
 	if err != nil {
 		err := gtserror.Newf("error counting followers: %w", err)
 		return nil, gtserror.NewErrorInternalError(err)
@@ -126,30 +135,36 @@ func (p *Processor) FollowersGet(ctx context.Context, requestedUsername string,
 
 	var obj vocab.Type
 
-	// Start building AS collection params.
+	// Start the AS collection params.
 	var params ap.CollectionParams
 	params.ID = collectionID
 	params.Total = total
 
 	if page == nil {
-		// i.e. paging disabled, the simplest case.
-		//
-		// Just build collection object from params.
+		// i.e. paging disabled, return collection
+		// that links to first page (i.e. path below).
+		params.Query = make(url.Values, 1)
+		params.Query.Set("limit", "40") // enables paging
 		obj = ap.NewASOrderedCollection(params)
 	} else {
 		// i.e. paging enabled
 
 		// Get the request page of full follower objects with attached accounts.
-		followers, err := p.state.DB.GetAccountFollowers(ctx, requestedAccount.ID, page)
+		followers, err := p.state.DB.GetAccountFollowers(ctx, receiver.ID, page)
 		if err != nil {
 			err := gtserror.Newf("error getting followers: %w", err)
 			return nil, gtserror.NewErrorInternalError(err)
 		}
 
-		// Get the lowest and highest
-		// ID values, used for paging.
-		lo := followers[len(followers)-1].ID
-		hi := followers[0].ID
+		// page ID values.
+		var lo, hi string
+
+		if len(followers) > 0 {
+			// Get the lowest and highest
+			// ID values, used for paging.
+			lo = followers[len(followers)-1].ID
+			hi = followers[0].ID
+		}
 
 		// Start building AS collection page params.
 		var pageParams ap.CollectionPageParams
@@ -196,21 +211,22 @@ func (p *Processor) FollowersGet(ctx context.Context, requestedUsername string,
 
 // FollowingGet handles the getting of a fedi/activitypub representation of a user/account's following, performing appropriate
 // authentication before returning a JSON serializable interface to the caller.
-func (p *Processor) FollowingGet(ctx context.Context, requestedUsername string, page *paging.Page) (interface{}, gtserror.WithCode) {
-	requestedAccount, _, errWithCode := p.authenticate(ctx, requestedUsername)
+func (p *Processor) FollowingGet(ctx context.Context, requestedUser string, page *paging.Page) (interface{}, gtserror.WithCode) {
+	// Authenticate the incoming request, getting related user accounts.
+	_, receiver, errWithCode := p.authenticate(ctx, requestedUser)
 	if errWithCode != nil {
 		return nil, errWithCode
 	}
 
-	// Parse the collection ID object from account's following URI.
-	collectionID, err := url.Parse(requestedAccount.FollowingURI)
+	// Parse collection ID from account's following URI.
+	collectionID, err := url.Parse(receiver.FollowingURI)
 	if err != nil {
-		err := gtserror.Newf("error parsing account following uri %s: %w", requestedAccount.FollowingURI, err)
+		err := gtserror.Newf("error parsing account following uri %s: %w", receiver.FollowingURI, err)
 		return nil, gtserror.NewErrorInternalError(err)
 	}
 
 	// Calculate total number of following available for account.
-	total, err := p.state.DB.CountAccountFollows(ctx, requestedAccount.ID)
+	total, err := p.state.DB.CountAccountFollows(ctx, receiver.ID)
 	if err != nil {
 		err := gtserror.Newf("error counting follows: %w", err)
 		return nil, gtserror.NewErrorInternalError(err)
@@ -218,32 +234,38 @@ func (p *Processor) FollowingGet(ctx context.Context, requestedUsername string,
 
 	var obj vocab.Type
 
-	// Start building AS collection params.
+	// Start AS collection params.
 	var params ap.CollectionParams
 	params.ID = collectionID
 	params.Total = total
 
 	if page == nil {
-		// i.e. paging disabled, the simplest case.
-		//
-		// Just build collection object from params.
+		// i.e. paging disabled, return collection
+		// that links to first page (i.e. path below).
+		params.Query = make(url.Values, 1)
+		params.Query.Set("limit", "40") // enables paging
 		obj = ap.NewASOrderedCollection(params)
 	} else {
 		// i.e. paging enabled
 
 		// Get the request page of full follower objects with attached accounts.
-		follows, err := p.state.DB.GetAccountFollows(ctx, requestedAccount.ID, page)
+		follows, err := p.state.DB.GetAccountFollows(ctx, receiver.ID, page)
 		if err != nil {
 			err := gtserror.Newf("error getting follows: %w", err)
 			return nil, gtserror.NewErrorInternalError(err)
 		}
 
-		// Get the lowest and highest
-		// ID values, used for paging.
-		lo := follows[len(follows)-1].ID
-		hi := follows[0].ID
+		// page ID values.
+		var lo, hi string
 
-		// Start building AS collection page params.
+		if len(follows) > 0 {
+			// Get the lowest and highest
+			// ID values, used for paging.
+			lo = follows[len(follows)-1].ID
+			hi = follows[0].ID
+		}
+
+		// Start AS collection page params.
 		var pageParams ap.CollectionPageParams
 		pageParams.CollectionParams = params
 
@@ -288,20 +310,21 @@ func (p *Processor) FollowingGet(ctx context.Context, requestedUsername string,
 
 // FeaturedCollectionGet returns an ordered collection of the requested username's Pinned posts.
 // The returned collection have an `items` property which contains an ordered list of status URIs.
-func (p *Processor) FeaturedCollectionGet(ctx context.Context, requestedUsername string) (interface{}, gtserror.WithCode) {
-	requestedAccount, _, errWithCode := p.authenticate(ctx, requestedUsername)
+func (p *Processor) FeaturedCollectionGet(ctx context.Context, requestedUser string) (interface{}, gtserror.WithCode) {
+	// Authenticate the incoming request, getting related user accounts.
+	_, receiver, errWithCode := p.authenticate(ctx, requestedUser)
 	if errWithCode != nil {
 		return nil, errWithCode
 	}
 
-	statuses, err := p.state.DB.GetAccountPinnedStatuses(ctx, requestedAccount.ID)
+	statuses, err := p.state.DB.GetAccountPinnedStatuses(ctx, receiver.ID)
 	if err != nil {
 		if !errors.Is(err, db.ErrNoEntries) {
 			return nil, gtserror.NewErrorInternalError(err)
 		}
 	}
 
-	collection, err := p.converter.StatusesToASFeaturedCollection(ctx, requestedAccount.FeaturedCollectionURI, statuses)
+	collection, err := p.converter.StatusesToASFeaturedCollection(ctx, receiver.FeaturedCollectionURI, statuses)
 	if err != nil {
 		return nil, gtserror.NewErrorInternalError(err)
 	}
diff --git a/internal/processing/fedi/common.go b/internal/processing/fedi/common.go
index c41f1e00c..f395ec3cf 100644
--- a/internal/processing/fedi/common.go
+++ b/internal/processing/fedi/common.go
@@ -20,7 +20,6 @@ package fedi
 import (
 	"context"
 	"errors"
-	"fmt"
 
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
@@ -28,17 +27,17 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 )
 
-func (p *Processor) authenticate(ctx context.Context, requestedUsername string) (
-	*gtsmodel.Account, // requestedAccount
-	*gtsmodel.Account, // requestingAccount
+func (p *Processor) authenticate(ctx context.Context, requestedUser string) (
+	*gtsmodel.Account, // requester: i.e. user making the request
+	*gtsmodel.Account, // receiver: i.e. the receiving inbox user
 	gtserror.WithCode,
 ) {
-	// Get LOCAL account with the requested username.
-	requestedAccount, err := p.state.DB.GetAccountByUsernameDomain(ctx, requestedUsername, "")
+	// First get the requested (receiving) LOCAL account with username from database.
+	receiver, err := p.state.DB.GetAccountByUsernameDomain(ctx, requestedUser, "")
 	if err != nil {
 		if !errors.Is(err, db.ErrNoEntries) {
 			// Real db error.
-			err = gtserror.Newf("db error getting account %s: %w", requestedUsername, err)
+			err = gtserror.Newf("db error getting account %s: %w", requestedUser, err)
 			return nil, nil, gtserror.NewErrorInternalError(err)
 		}
 
@@ -46,41 +45,43 @@ func (p *Processor) authenticate(ctx context.Context, requestedUsername string)
 		return nil, nil, gtserror.NewErrorNotFound(err)
 	}
 
+	var requester *gtsmodel.Account
+
 	// Ensure request signed, and use signature URI to
 	// get requesting account, dereferencing if necessary.
-	pubKeyAuth, errWithCode := p.federator.AuthenticateFederatedRequest(ctx, requestedUsername)
+	pubKeyAuth, errWithCode := p.federator.AuthenticateFederatedRequest(ctx, requestedUser)
 	if errWithCode != nil {
 		return nil, nil, errWithCode
 	}
 
-	requestingAccount, _, err := p.federator.GetAccountByURI(
-		gtscontext.SetFastFail(ctx),
-		requestedUsername,
-		pubKeyAuth.OwnerURI,
-	)
-	if err != nil {
-		err = gtserror.Newf("error getting account %s: %w", pubKeyAuth.OwnerURI, err)
-		return nil, nil, gtserror.NewErrorUnauthorized(err)
+	if requester = pubKeyAuth.Owner; requester == nil {
+		requester, _, err = p.federator.GetAccountByURI(
+			gtscontext.SetFastFail(ctx),
+			requestedUser,
+			pubKeyAuth.OwnerURI,
+		)
+		if err != nil {
+			err = gtserror.Newf("error getting account %s: %w", pubKeyAuth.OwnerURI, err)
+			return nil, nil, gtserror.NewErrorUnauthorized(err)
+		}
 	}
 
-	if !requestingAccount.SuspendedAt.IsZero() {
+	if !requester.SuspendedAt.IsZero() {
 		// Account was marked as suspended by a
 		// local admin action. Stop request early.
-		err = fmt.Errorf("account %s marked as suspended", requestingAccount.ID)
-		return nil, nil, gtserror.NewErrorForbidden(err)
+		const text = "requesting account is suspended"
+		return nil, nil, gtserror.NewErrorForbidden(errors.New(text))
 	}
 
 	// Ensure no block exists between requester + requested.
-	blocked, err := p.state.DB.IsEitherBlocked(ctx, requestedAccount.ID, requestingAccount.ID)
+	blocked, err := p.state.DB.IsEitherBlocked(ctx, receiver.ID, requester.ID)
 	if err != nil {
 		err = gtserror.Newf("db error getting checking block: %w", err)
 		return nil, nil, gtserror.NewErrorInternalError(err)
-	}
-
-	if blocked {
-		err = fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID)
+	} else if blocked {
+		err = gtserror.Newf("block exists between accounts %s and %s", requester.ID, receiver.ID)
 		return nil, nil, gtserror.NewErrorForbidden(err)
 	}
 
-	return requestedAccount, requestingAccount, nil
+	return requester, receiver, nil
 }
diff --git a/internal/processing/fedi/fedi.go b/internal/processing/fedi/fedi.go
index 11be26a3e..eeef94113 100644
--- a/internal/processing/fedi/fedi.go
+++ b/internal/processing/fedi/fedi.go
@@ -19,21 +19,33 @@ package fedi
 
 import (
 	"github.com/superseriousbusiness/gotosocial/internal/federation"
+	"github.com/superseriousbusiness/gotosocial/internal/processing/common"
 	"github.com/superseriousbusiness/gotosocial/internal/state"
 	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
 	"github.com/superseriousbusiness/gotosocial/internal/visibility"
 )
 
 type Processor struct {
+	// embed common logic
+	c *common.Processor
+
 	state     *state.State
 	federator *federation.Federator
 	converter *typeutils.Converter
 	filter    *visibility.Filter
 }
 
-// New returns a new fedi processor.
-func New(state *state.State, converter *typeutils.Converter, federator *federation.Federator, filter *visibility.Filter) Processor {
+// New returns a
+// new fedi processor.
+func New(
+	state *state.State,
+	common *common.Processor,
+	converter *typeutils.Converter,
+	federator *federation.Federator,
+	filter *visibility.Filter,
+) Processor {
 	return Processor{
+		c:         common,
 		state:     state,
 		federator: federator,
 		converter: converter,
diff --git a/internal/processing/fedi/status.go b/internal/processing/fedi/status.go
index c8534eb5e..b8b75841c 100644
--- a/internal/processing/fedi/status.go
+++ b/internal/processing/fedi/status.go
@@ -19,161 +19,192 @@ package fedi
 
 import (
 	"context"
-	"fmt"
+	"errors"
 	"net/url"
+	"slices"
+	"strconv"
 
+	"github.com/superseriousbusiness/activity/streams/vocab"
 	"github.com/superseriousbusiness/gotosocial/internal/ap"
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/log"
+	"github.com/superseriousbusiness/gotosocial/internal/paging"
 )
 
 // StatusGet handles the getting of a fedi/activitypub representation of a local status.
 // It performs appropriate authentication before returning a JSON serializable interface.
-func (p *Processor) StatusGet(ctx context.Context, requestedUsername string, requestedStatusID string) (interface{}, gtserror.WithCode) {
+func (p *Processor) StatusGet(ctx context.Context, requestedUser string, statusID string) (interface{}, gtserror.WithCode) {
 	// Authenticate using http signature.
-	requestedAccount, requestingAccount, errWithCode := p.authenticate(ctx, requestedUsername)
+	// Authenticate the incoming request, getting related user accounts.
+	requester, receiver, errWithCode := p.authenticate(ctx, requestedUser)
 	if errWithCode != nil {
 		return nil, errWithCode
 	}
 
-	status, err := p.state.DB.GetStatusByID(ctx, requestedStatusID)
+	status, err := p.state.DB.GetStatusByID(ctx, statusID)
 	if err != nil {
 		return nil, gtserror.NewErrorNotFound(err)
 	}
 
-	if status.AccountID != requestedAccount.ID {
-		err := fmt.Errorf("status with id %s does not belong to account with id %s", status.ID, requestedAccount.ID)
-		return nil, gtserror.NewErrorNotFound(err)
+	if status.AccountID != receiver.ID {
+		const text = "status does not belong to receiving account"
+		return nil, gtserror.NewErrorNotFound(errors.New(text))
 	}
 
-	visible, err := p.filter.StatusVisible(ctx, requestingAccount, status)
+	visible, err := p.filter.StatusVisible(ctx, requester, status)
 	if err != nil {
 		return nil, gtserror.NewErrorInternalError(err)
 	}
 
 	if !visible {
-		err := fmt.Errorf("status with id %s not visible to user with id %s", status.ID, requestingAccount.ID)
-		return nil, gtserror.NewErrorNotFound(err)
+		const text = "status not vising to requesting account"
+		return nil, gtserror.NewErrorNotFound(errors.New(text))
 	}
 
 	statusable, err := p.converter.StatusToAS(ctx, status)
 	if err != nil {
+		err := gtserror.Newf("error converting status: %w", err)
 		return nil, gtserror.NewErrorInternalError(err)
 	}
 
 	data, err := ap.Serialize(statusable)
 	if err != nil {
+		err := gtserror.Newf("error serializing status: %w", err)
 		return nil, gtserror.NewErrorInternalError(err)
 	}
 
 	return data, nil
 }
 
-// GetStatus handles the getting of a fedi/activitypub representation of replies to a status, performing appropriate
-// authentication before returning a JSON serializable interface to the caller.
-func (p *Processor) StatusRepliesGet(ctx context.Context, requestedUsername string, requestedStatusID string, page bool, onlyOtherAccounts bool, onlyOtherAccountsSet bool, minID string) (interface{}, gtserror.WithCode) {
-	requestedAccount, requestingAccount, errWithCode := p.authenticate(ctx, requestedUsername)
+// GetStatus handles the getting of a fedi/activitypub representation of replies to a status,
+// performing appropriate authentication before returning a JSON serializable interface to the caller.
+func (p *Processor) StatusRepliesGet(
+	ctx context.Context,
+	requestedUser string,
+	statusID string,
+	page *paging.Page,
+	onlyOtherAccounts bool,
+) (interface{}, gtserror.WithCode) {
+	// Authenticate the incoming request, getting related user accounts.
+	requester, receiver, errWithCode := p.authenticate(ctx, requestedUser)
+	if errWithCode != nil {
+		return nil, errWithCode
+	}
+
+	// Get target status and ensure visible to requester.
+	status, errWithCode := p.c.GetVisibleTargetStatus(ctx,
+		requester,
+		statusID,
+	)
 	if errWithCode != nil {
 		return nil, errWithCode
 	}
 
-	status, err := p.state.DB.GetStatusByID(ctx, requestedStatusID)
+	// Ensure status is by receiving account.
+	if status.AccountID != receiver.ID {
+		const text = "status does not belong to receiving account"
+		return nil, gtserror.NewErrorNotFound(errors.New(text))
+	}
+
+	// Parse replies collection ID from status' URI with onlyOtherAccounts param.
+	onlyOtherAccStr := "only_other_accounts=" + strconv.FormatBool(onlyOtherAccounts)
+	collectionID, err := url.Parse(status.URI + "/replies?" + onlyOtherAccStr)
 	if err != nil {
-		return nil, gtserror.NewErrorNotFound(err)
+		err := gtserror.Newf("error parsing status uri %s: %w", status.URI, err)
+		return nil, gtserror.NewErrorInternalError(err)
 	}
 
-	if status.AccountID != requestedAccount.ID {
-		return nil, gtserror.NewErrorNotFound(fmt.Errorf("status with id %s does not belong to account with id %s", status.ID, requestedAccount.ID))
+	// Get *all* available replies for status (i.e. without paging).
+	replies, err := p.state.DB.GetStatusReplies(ctx, status.ID)
+	if err != nil {
+		err := gtserror.Newf("error getting status replies: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
 	}
 
-	visible, err := p.filter.StatusVisible(ctx, requestedAccount, status)
+	if onlyOtherAccounts {
+		// If 'onlyOtherAccounts' is set, drop all by original status author.
+		replies = slices.DeleteFunc(replies, func(reply *gtsmodel.Status) bool {
+			return reply.AccountID == status.AccountID
+		})
+	}
+
+	// Reslice replies dropping all those invisible to requester.
+	replies, err = p.filter.StatusesVisible(ctx, requester, replies)
 	if err != nil {
+		err := gtserror.Newf("error filtering status replies: %w", err)
 		return nil, gtserror.NewErrorInternalError(err)
 	}
-	if !visible {
-		return nil, gtserror.NewErrorNotFound(fmt.Errorf("status with id %s not visible to user with id %s", status.ID, requestingAccount.ID))
-	}
-
-	var data map[string]interface{}
-
-	// now there are three scenarios:
-	// 1. we're asked for the whole collection and not a page -- we can just return the collection, with no items, but a link to 'first' page.
-	// 2. we're asked for a page but only_other_accounts has not been set in the query -- so we should just return the first page of the collection, with no items.
-	// 3. we're asked for a page, and only_other_accounts has been set, and min_id has optionally been set -- so we need to return some actual items!
-	switch {
-	case !page:
-		// scenario 1
-		// get the collection
-		collection, err := p.converter.StatusToASRepliesCollection(ctx, status, onlyOtherAccounts)
-		if err != nil {
-			return nil, gtserror.NewErrorInternalError(err)
-		}
 
-		data, err = ap.Serialize(collection)
-		if err != nil {
-			return nil, gtserror.NewErrorInternalError(err)
-		}
-	case page && !onlyOtherAccountsSet:
-		// scenario 2
-		// get the collection
-		collection, err := p.converter.StatusToASRepliesCollection(ctx, status, onlyOtherAccounts)
-		if err != nil {
-			return nil, gtserror.NewErrorInternalError(err)
-		}
-		// but only return the first page
-		data, err = ap.Serialize(collection.GetActivityStreamsFirst().GetActivityStreamsCollectionPage())
-		if err != nil {
-			return nil, gtserror.NewErrorInternalError(err)
-		}
-	default:
-		// scenario 3
-		// get immediate children
-		replies, err := p.state.DB.GetStatusChildren(ctx, status, true, minID)
-		if err != nil {
-			return nil, gtserror.NewErrorInternalError(err)
+	var obj vocab.Type
+
+	// Start AS collection params.
+	var params ap.CollectionParams
+	params.ID = collectionID
+	params.Total = len(replies)
+
+	if page == nil {
+		// i.e. paging disabled, return collection
+		// that links to first page (i.e. path below).
+		params.Query = make(url.Values, 1)
+		params.Query.Set("limit", "20") // enables paging
+		obj = ap.NewASOrderedCollection(params)
+	} else {
+		// i.e. paging enabled
+
+		// Page and reslice the replies according to given parameters.
+		replies = paging.Page_PageFunc(page, replies, func(reply *gtsmodel.Status) string {
+			return reply.ID
+		})
+
+		// page ID values.
+		var lo, hi string
+
+		if len(replies) > 0 {
+			// Get the lowest and highest
+			// ID values, used for paging.
+			lo = replies[len(replies)-1].ID
+			hi = replies[0].ID
 		}
 
-		// filter children and extract URIs
-		replyURIs := map[string]*url.URL{}
-		for _, r := range replies {
-			// only show public or unlocked statuses as replies
-			if r.Visibility != gtsmodel.VisibilityPublic && r.Visibility != gtsmodel.VisibilityUnlocked {
-				continue
-			}
+		// Start AS collection page params.
+		var pageParams ap.CollectionPageParams
+		pageParams.CollectionParams = params
 
-			// respect onlyOtherAccounts parameter
-			if onlyOtherAccounts && r.AccountID == requestedAccount.ID {
-				continue
-			}
+		// Current page details.
+		pageParams.Current = page
+		pageParams.Count = len(replies)
 
-			// only show replies that the status owner can see
-			visibleToStatusOwner, err := p.filter.StatusVisible(ctx, requestedAccount, r)
-			if err != nil || !visibleToStatusOwner {
-				continue
-			}
+		// Set linked next/prev parameters.
+		pageParams.Next = page.Next(lo, hi)
+		pageParams.Prev = page.Prev(lo, hi)
 
-			// only show replies that the requester can see
-			visibleToRequester, err := p.filter.StatusVisible(ctx, requestingAccount, r)
-			if err != nil || !visibleToRequester {
-				continue
-			}
+		// Set the collection item property builder function.
+		pageParams.Append = func(i int, itemsProp ap.ItemsPropertyBuilder) {
+			// Get follower URI at index.
+			status := replies[i]
+			uri := status.URI
 
-			rURI, err := url.Parse(r.URI)
+			// Parse URL object from URI.
+			iri, err := url.Parse(uri)
 			if err != nil {
-				continue
+				log.Errorf(ctx, "error parsing status uri %s: %v", uri, err)
+				return
 			}
 
-			replyURIs[r.ID] = rURI
+			// Add to item property.
+			itemsProp.AppendIRI(iri)
 		}
 
-		repliesPage, err := p.converter.StatusURIsToASRepliesPage(ctx, status, onlyOtherAccounts, minID, replyURIs)
-		if err != nil {
-			return nil, gtserror.NewErrorInternalError(err)
-		}
-		data, err = ap.Serialize(repliesPage)
-		if err != nil {
-			return nil, gtserror.NewErrorInternalError(err)
-		}
+		// Build AS collection page object from params.
+		obj = ap.NewASOrderedCollectionPage(pageParams)
+	}
+
+	// Serialized the prepared object.
+	data, err := ap.Serialize(obj)
+	if err != nil {
+		err := gtserror.Newf("error serializing: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
 	}
 
 	return data, nil
diff --git a/internal/processing/processor.go b/internal/processing/processor.go
index 65f05f49e..ac930aeb2 100644
--- a/internal/processing/processor.go
+++ b/internal/processing/processor.go
@@ -156,23 +156,23 @@ func NewProcessor(
 	//
 	// Start with sub processors that will
 	// be required by the workers processor.
-	commonProcessor := common.New(state, converter, federator, filter)
-	processor.account = account.New(&commonProcessor, state, converter, mediaManager, oauthServer, federator, filter, parseMentionFunc)
+	common := common.New(state, converter, federator, filter)
+	processor.account = account.New(&common, state, converter, mediaManager, oauthServer, federator, filter, parseMentionFunc)
 	processor.media = media.New(state, converter, mediaManager, federator.TransportController())
 	processor.stream = stream.New(state, oauthServer)
 
 	// Instantiate the rest of the sub
 	// processors + pin them to this struct.
-	processor.account = account.New(&commonProcessor, state, converter, mediaManager, oauthServer, federator, filter, parseMentionFunc)
+	processor.account = account.New(&common, state, converter, mediaManager, oauthServer, federator, filter, parseMentionFunc)
 	processor.admin = admin.New(state, cleaner, converter, mediaManager, federator.TransportController(), emailSender)
-	processor.fedi = fedi.New(state, converter, federator, filter)
+	processor.fedi = fedi.New(state, &common, converter, federator, filter)
 	processor.list = list.New(state, converter)
 	processor.markers = markers.New(state, converter)
-	processor.polls = polls.New(&commonProcessor, state, converter)
+	processor.polls = polls.New(&common, state, converter)
 	processor.report = report.New(state, converter)
 	processor.timeline = timeline.New(state, converter, filter)
 	processor.search = search.New(state, federator, converter, filter)
-	processor.status = status.New(state, &commonProcessor, &processor.polls, federator, converter, filter, parseMentionFunc)
+	processor.status = status.New(state, &common, &processor.polls, federator, converter, filter, parseMentionFunc)
 	processor.user = user.New(state, emailSender)
 
 	// Workers processor handles asynchronous
diff --git a/internal/processing/status/get.go b/internal/processing/status/get.go
index ae6918e3f..c182bd148 100644
--- a/internal/processing/status/get.go
+++ b/internal/processing/status/get.go
@@ -67,7 +67,7 @@ func (p *Processor) contextGet(
 		Descendants: []apimodel.Status{},
 	}
 
-	parents, err := p.state.DB.GetStatusParents(ctx, targetStatus, false)
+	parents, err := p.state.DB.GetStatusParents(ctx, targetStatus)
 	if err != nil {
 		return nil, gtserror.NewErrorInternalError(err)
 	}
@@ -85,7 +85,7 @@ func (p *Processor) contextGet(
 		return context.Ancestors[i].ID < context.Ancestors[j].ID
 	})
 
-	children, err := p.state.DB.GetStatusChildren(ctx, targetStatus, false, "")
+	children, err := p.state.DB.GetStatusChildren(ctx, targetStatus.ID)
 	if err != nil {
 		return nil, gtserror.NewErrorInternalError(err)
 	}
diff --git a/internal/util/ptr.go b/internal/util/ptr.go
index 2ce96e1d1..0ad207617 100644
--- a/internal/util/ptr.go
+++ b/internal/util/ptr.go
@@ -33,3 +33,11 @@ func EqualPtrs[T comparable](t1, t2 *T) bool {
 func Ptr[T any](t T) *T {
 	return &t
 }
+
+// PtrValueOr returns either value of ptr, or default.
+func PtrValueOr[T any](t *T, _default T) T {
+	if t != nil {
+		return *t
+	}
+	return _default
+}
diff --git a/internal/visibility/home_timeline.go b/internal/visibility/home_timeline.go
index 56290e836..273ca8457 100644
--- a/internal/visibility/home_timeline.go
+++ b/internal/visibility/home_timeline.go
@@ -20,7 +20,6 @@ package visibility
 import (
 	"context"
 	"errors"
-	"fmt"
 	"time"
 
 	"github.com/superseriousbusiness/gotosocial/internal/cache"
@@ -219,7 +218,7 @@ func (f *Filter) isVisibleConversation(ctx context.Context, owner *gtsmodel.Acco
 			status.AccountID,
 		)
 		if err != nil {
-			return false, fmt.Errorf("error checking follow %s->%s: %w", owner.ID, status.AccountID, err)
+			return false, gtserror.Newf("error checking follow %s->%s: %w", owner.ID, status.AccountID, err)
 		}
 
 		if !followAuthor {
@@ -236,7 +235,7 @@ func (f *Filter) isVisibleConversation(ctx context.Context, owner *gtsmodel.Acco
 			mention.TargetAccountID,
 		)
 		if err != nil {
-			return false, fmt.Errorf("error checking mention follow %s->%s: %w", owner.ID, mention.TargetAccountID, err)
+			return false, gtserror.Newf("error checking mention follow %s->%s: %w", owner.ID, mention.TargetAccountID, err)
 		}
 
 		if follow {
diff --git a/internal/visibility/public_timeline.go b/internal/visibility/public_timeline.go
index 77ce5760c..63e802614 100644
--- a/internal/visibility/public_timeline.go
+++ b/internal/visibility/public_timeline.go
@@ -19,11 +19,11 @@ package visibility
 
 import (
 	"context"
-	"fmt"
 	"time"
 
 	"github.com/superseriousbusiness/gotosocial/internal/cache"
 	"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 	"github.com/superseriousbusiness/gotosocial/internal/log"
 )
@@ -105,7 +105,7 @@ func (f *Filter) isStatusPublicTimelineable(ctx context.Context, requester *gtsm
 			parentID,
 		)
 		if err != nil {
-			return false, fmt.Errorf("isStatusPublicTimelineable: error getting status parent %s: %w", parentID, err)
+			return false, gtserror.Newf("error getting status parent %s: %w", parentID, err)
 		}
 
 		if parent.AccountID != status.AccountID {
diff --git a/internal/visibility/status.go b/internal/visibility/status.go
index d41bbc80b..3684bae4f 100644
--- a/internal/visibility/status.go
+++ b/internal/visibility/status.go
@@ -19,32 +19,26 @@ package visibility
 
 import (
 	"context"
-	"fmt"
+	"slices"
 
 	"github.com/superseriousbusiness/gotosocial/internal/cache"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 	"github.com/superseriousbusiness/gotosocial/internal/log"
 )
 
 // StatusesVisible calls StatusVisible for each status in the statuses slice, and returns a slice of only statuses which are visible to the requester.
 func (f *Filter) StatusesVisible(ctx context.Context, requester *gtsmodel.Account, statuses []*gtsmodel.Status) ([]*gtsmodel.Status, error) {
-	// Preallocate slice of maximum possible length.
-	filtered := make([]*gtsmodel.Status, 0, len(statuses))
-
-	for _, status := range statuses {
-		// Check whether status is visible to requester.
+	var errs gtserror.MultiError
+	filtered := slices.DeleteFunc(statuses, func(status *gtsmodel.Status) bool {
 		visible, err := f.StatusVisible(ctx, requester, status)
 		if err != nil {
-			return nil, err
-		}
-
-		if visible {
-			// Add filtered status to ret slice.
-			filtered = append(filtered, status)
+			errs.Append(err)
+			return true
 		}
-	}
-
-	return filtered, nil
+		return !visible
+	})
+	return filtered, errs.Combine()
 }
 
 // StatusVisible will check if given status is visible to requester, accounting for requester with no auth (i.e is nil), suspensions, disabled local users, account blocks and status privacy.
@@ -85,13 +79,13 @@ func (f *Filter) StatusVisible(ctx context.Context, requester *gtsmodel.Account,
 func (f *Filter) isStatusVisible(ctx context.Context, requester *gtsmodel.Account, status *gtsmodel.Status) (bool, error) {
 	// Ensure that status is fully populated for further processing.
 	if err := f.state.DB.PopulateStatus(ctx, status); err != nil {
-		return false, fmt.Errorf("isStatusVisible: error populating status %s: %w", status.ID, err)
+		return false, gtserror.Newf("error populating status %s: %w", status.ID, err)
 	}
 
 	// Check whether status accounts are visible to the requester.
 	visible, err := f.areStatusAccountsVisible(ctx, requester, status)
 	if err != nil {
-		return false, fmt.Errorf("isStatusVisible: error checking status %s account visibility: %w", status.ID, err)
+		return false, gtserror.Newf("error checking status %s account visibility: %w", status.ID, err)
 	} else if !visible {
 		return false, nil
 	}
@@ -127,7 +121,7 @@ func (f *Filter) isStatusVisible(ctx context.Context, requester *gtsmodel.Accoun
 			// Boosted status needs its mentions populating, fetch these from database.
 			status.BoostOf.Mentions, err = f.state.DB.GetMentions(ctx, status.BoostOf.MentionIDs)
 			if err != nil {
-				return false, fmt.Errorf("isStatusVisible: error populating boosted status %s mentions: %w", status.BoostOfID, err)
+				return false, gtserror.Newf("error populating boosted status %s mentions: %w", status.BoostOfID, err)
 			}
 		}
 
@@ -145,7 +139,7 @@ func (f *Filter) isStatusVisible(ctx context.Context, requester *gtsmodel.Accoun
 			status.AccountID,
 		)
 		if err != nil {
-			return false, fmt.Errorf("isStatusVisible: error checking follow %s->%s: %w", requester.ID, status.AccountID, err)
+			return false, gtserror.Newf("error checking follow %s->%s: %w", requester.ID, status.AccountID, err)
 		}
 
 		if !follows {
@@ -162,7 +156,7 @@ func (f *Filter) isStatusVisible(ctx context.Context, requester *gtsmodel.Accoun
 			status.AccountID,
 		)
 		if err != nil {
-			return false, fmt.Errorf("isStatusVisible: error checking mutual follow %s<->%s: %w", requester.ID, status.AccountID, err)
+			return false, gtserror.Newf("error checking mutual follow %s<->%s: %w", requester.ID, status.AccountID, err)
 		}
 
 		if !mutuals {
@@ -187,7 +181,7 @@ func (f *Filter) areStatusAccountsVisible(ctx context.Context, requester *gtsmod
 	// Check whether status author's account is visible to requester.
 	visible, err := f.AccountVisible(ctx, requester, status.Account)
 	if err != nil {
-		return false, fmt.Errorf("error checking status author visibility: %w", err)
+		return false, gtserror.Newf("error checking status author visibility: %w", err)
 	}
 
 	if !visible {
@@ -206,7 +200,7 @@ func (f *Filter) areStatusAccountsVisible(ctx context.Context, requester *gtsmod
 		// Check whether boosted status author's account is visible to requester.
 		visible, err := f.AccountVisible(ctx, requester, status.BoostOfAccount)
 		if err != nil {
-			return false, fmt.Errorf("error checking boosted author visibility: %w", err)
+			return false, gtserror.Newf("error checking boosted author visibility: %w", err)
 		}
 
 		if !visible {