[chore] The Big Middleware and API Refactor (tm) (#1250)

* interim commit: start refactoring middlewares into package under router

* another interim commit, this is becoming a big job

* another fucking massive interim commit

* refactor bookmarks to new style

* ambassador, wiz zeze commits you are spoiling uz

* she compiles, we're getting there

* we're just normal men; we're just innocent men

* apiutil

* whoopsie

* i'm glad noone reads commit msgs haha :blob_sweat:

* use that weirdo go-bytesize library for maxMultipartMemory

* fix media module paths

1 files changed, 187 insertions, 0 deletions

diff --git a/internal/api/client/timelines/public.go b/internal/api/client/timelines/public.go
new file mode 100644
index 000000000..efe351a37
--- /dev/null
+++ b/internal/api/client/timelines/public.go
@@ -0,0 +1,187 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
+
+   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 timelines
+
+import (
+	"fmt"
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+)
+
+// PublicTimelineGETHandler swagger:operation GET /api/v1/timelines/public publicTimeline
+//
+// See public statuses/posts that your instance is aware of.
+//
+// The statuses will be returned in descending chronological order (newest first), with sequential IDs (bigger = newer).
+//
+// The returned Link header can be used to generate the previous and next queries when scrolling up or down a timeline.
+//
+// Example:
+//
+// ```
+// <https://example.org/api/v1/timelines/public?limit=20&max_id=01FC3GSQ8A3MMJ43BPZSGEG29M>; rel="next", <https://example.org/api/v1/timelines/public?limit=20&min_id=01FC3KJW2GYXSDDRA6RWNDM46M>; rel="prev"
+// ````
+//
+//	---
+//	tags:
+//	- timelines
+//
+//	produces:
+//	- application/json
+//
+//	parameters:
+//	-
+//		name: max_id
+//		type: string
+//		description: >-
+//			Return only statuses *OLDER* than the given max status ID.
+//			The status with the specified ID will not be included in the response.
+//		in: query
+//		required: false
+//	-
+//		name: since_id
+//		type: string
+//		description: >-
+//			Return only statuses *NEWER* than the given since status ID.
+//			The status with the specified ID will not be included in the response.
+//		in: query
+//	-
+//		name: min_id
+//		type: string
+//		description: >-
+//			Return only statuses *NEWER* than the given since status ID.
+//			The status with the specified ID will not be included in the response.
+//		in: query
+//		required: false
+//	-
+//		name: limit
+//		type: integer
+//		description: Number of statuses to return.
+//		default: 20
+//		in: query
+//		required: false
+//	-
+//		name: local
+//		type: boolean
+//		description: Show only statuses posted by local accounts.
+//		default: false
+//		in: query
+//		required: false
+//
+//	security:
+//	- OAuth2 Bearer:
+//		- read:statuses
+//
+//	responses:
+//		'200':
+//			name: statuses
+//			description: Array of statuses.
+//			schema:
+//				type: array
+//				items:
+//					"$ref": "#/definitions/status"
+//			headers:
+//				Link:
+//					type: string
+//					description: Links to the next and previous queries.
+//		'401':
+//			description: unauthorized
+//		'400':
+//			description: bad request
+func (m *Module) PublicTimelineGETHandler(c *gin.Context) {
+	var authed *oauth.Auth
+	var err error
+
+	if config.GetInstanceExposePublicTimeline() {
+		// If the public timeline is allowed to be exposed, still check if we
+		// can extract various authentication properties, but don't require them.
+		authed, err = oauth.Authed(c, false, false, false, false)
+	} else {
+		authed, err = oauth.Authed(c, true, true, true, true)
+	}
+
+	if err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorUnauthorized(err, err.Error()), m.processor.InstanceGet)
+		return
+	}
+
+	if _, err := apiutil.NegotiateAccept(c, apiutil.JSONAcceptHeaders...); err != nil {
+		apiutil.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
+		return
+	}
+
+	maxID := ""
+	maxIDString := c.Query(MaxIDKey)
+	if maxIDString != "" {
+		maxID = maxIDString
+	}
+
+	sinceID := ""
+	sinceIDString := c.Query(SinceIDKey)
+	if sinceIDString != "" {
+		sinceID = sinceIDString
+	}
+
+	minID := ""
+	minIDString := c.Query(MinIDKey)
+	if minIDString != "" {
+		minID = minIDString
+	}
+
+	limit := 20
+	limitString := c.Query(LimitKey)
+	if limitString != "" {
+		i, err := strconv.ParseInt(limitString, 10, 32)
+		if err != nil {
+			err := fmt.Errorf("error parsing %s: %s", LimitKey, err)
+			apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
+			return
+		}
+		limit = int(i)
+	}
+
+	local := false
+	localString := c.Query(LocalKey)
+	if localString != "" {
+		i, err := strconv.ParseBool(localString)
+		if err != nil {
+			err := fmt.Errorf("error parsing %s: %s", LocalKey, err)
+			apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
+			return
+		}
+		local = i
+	}
+
+	resp, errWithCode := m.processor.PublicTimelineGet(c.Request.Context(), authed, maxID, sinceID, minID, limit, local)
+	if errWithCode != nil {
+		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
+		return
+	}
+
+	if resp.LinkHeader != "" {
+		c.Header("Link", resp.LinkHeader)
+	}
+	c.JSON(http.StatusOK, resp.Items)
+}