[feature/frontend] Respect `prefers-reduced-motion` for avatars, headers, and emojis (#3118)

* [feature/frontend] Respect `prefers-reduced-motion` for avatars, headers, and emojis

* go fmt

* fix tests

* use static version of instance thumbnail when appropriate

* use prefers-reduced-motion

* simplify account conversion a bit

* fix c&p error

8 files changed, 51 insertions, 13 deletions

diff --git a/internal/api/client/instance/instancepatch_test.go b/internal/api/client/instance/instancepatch_test.go
index ba0d026f3..e68508fc2 100644
--- a/internal/api/client/instance/instancepatch_test.go
+++ b/internal/api/client/instance/instancepatch_test.go
@@ -762,6 +762,8 @@ func (suite *InstancePatchTestSuite) TestInstancePatch8() {
   },
   "thumbnail": "http://localhost:8080/fileserver/01AY6P665V14JJR0AFVRT7311Y/attachment/original/`+instanceAccount.AvatarMediaAttachment.ID+`.gif",`+`
   "thumbnail_type": "image/gif",
+  "thumbnail_static": "http://localhost:8080/fileserver/01AY6P665V14JJR0AFVRT7311Y/attachment/small/`+instanceAccount.AvatarMediaAttachment.ID+`.webp",`+`
+  "thumbnail_static_type": "image/webp",
   "thumbnail_description": "A bouncing little green peglin.",
   "contact_account": {
     "id": "01F8MH17FWEB39HZJ76B6VXSKF",
@@ -818,6 +820,8 @@ func (suite *InstancePatchTestSuite) TestInstancePatch8() {
 	suite.Equal(`{
   "url": "http://localhost:8080/fileserver/01AY6P665V14JJR0AFVRT7311Y/attachment/original/`+instanceAccount.AvatarMediaAttachment.ID+`.gif",`+`
   "thumbnail_type": "image/gif",
+  "static_url": "http://localhost:8080/fileserver/01AY6P665V14JJR0AFVRT7311Y/attachment/small/`+instanceAccount.AvatarMediaAttachment.ID+`.webp",`+`
+  "thumbnail_static_type": "image/webp",
   "thumbnail_description": "A bouncing little green peglin.",
   "blurhash": "LE9kG#M}4YtO%dRkWEt5Dmoxx?WC"
 }`, string(instanceV2ThumbnailJson))
diff --git a/internal/api/model/account.go b/internal/api/model/account.go
index cf39dd08e..c5b629db0 100644
--- a/internal/api/model/account.go
+++ b/internal/api/model/account.go
@@ -110,17 +110,27 @@ type Account struct {
 	// If set, indicates that this account is currently inactive, and has migrated to the given account.
 	// Key/value omitted for accounts that haven't moved, and for suspended accounts.
 	Moved *Account `json:"moved,omitempty"`
+}
 
-	// Additional fields not exposed via JSON
-	// (used only internally for templating etc).
+// WebAccount is like Account, but with
+// additional fields not exposed via JSON;
+// used only internally for templating etc.
+//
+// swagger:ignore
+type WebAccount struct {
+	*Account
 
 	// Proper attachment model for the avatar.
 	//
-	// Only set if this model was converted via
-	// AccountToWebAccount, AND this account had
-	// an avatar set (and not just the default
-	// "blank" avatar image.)
-	AvatarAttachment *Attachment `json:"-"`
+	// Only set if this account had an avatar set
+	// (and not just the default "blank" image.)
+	AvatarAttachment *WebAttachment `json:"-"`
+
+	// Proper attachment model for the header.
+	//
+	// Only set if this account had a header set
+	// (and not just the default "blank" image.)
+	HeaderAttachment *WebAttachment `json:"-"`
 }
 
 // MutedAccount extends Account with a field used only by the muted user list.
diff --git a/internal/api/model/attachment.go b/internal/api/model/attachment.go
index d0b0c81e5..21523a58e 100644
--- a/internal/api/model/attachment.go
+++ b/internal/api/model/attachment.go
@@ -107,6 +107,10 @@ type WebAttachment struct {
 	// MIME type of
 	// the attachment.
 	MIMEType string
+
+	// MIME type of
+	// the thumbnail.
+	PreviewMIMEType string
 }
 
 // MediaMeta models media metadata.
diff --git a/internal/api/model/instancev1.go b/internal/api/model/instancev1.go
index beb4f430d..efa6d6faa 100644
--- a/internal/api/model/instancev1.go
+++ b/internal/api/model/instancev1.go
@@ -85,6 +85,12 @@ type InstanceV1 struct {
 	// MIME type of the instance thumbnail.
 	// example: image/png
 	ThumbnailType string `json:"thumbnail_type,omitempty"`
+	// URL of the static instance avatar/banner image.
+	// example: https://example.org/files/instance/static/thumbnail.webp
+	ThumbnailStatic string `json:"thumbnail_static,omitempty"`
+	// MIME type of the static instance thumbnail.
+	// example: image/webp
+	ThumbnailStaticType string `json:"thumbnail_static_type,omitempty"`
 	// Description of the instance thumbnail.
 	// example: picture of a cute lil' friendly sloth
 	ThumbnailDescription string `json:"thumbnail_description,omitempty"`
diff --git a/internal/api/model/instancev2.go b/internal/api/model/instancev2.go
index fce801117..8d6873497 100644
--- a/internal/api/model/instancev2.go
+++ b/internal/api/model/instancev2.go
@@ -102,6 +102,13 @@ type InstanceV2Thumbnail struct {
 	// Key/value not set if thumbnail image type unknown.
 	// example: image/png
 	Type string `json:"thumbnail_type,omitempty"`
+	// StaticURL version of the thumbnail image.
+	// example: https://example.org/fileserver/01BPSX2MKCRVMD4YN4D71G9CP5/attachment/static/01H88X0KQ2DFYYDSWYP93VDJZA.webp
+	StaticURL string `json:"static_url,omitempty"`
+	// MIME type of the instance thumbnail.
+	// Key/value not set if thumbnail image type unknown.
+	// example: image/png
+	StaticType string `json:"thumbnail_static_type,omitempty"`
 	// Description of the instance thumbnail.
 	// Key/value not set if no description available.
 	// example: picture of a cute lil' friendly sloth
diff --git a/internal/api/model/status.go b/internal/api/model/status.go
index 7358916ab..b3ac746d7 100644
--- a/internal/api/model/status.go
+++ b/internal/api/model/status.go
@@ -113,6 +113,9 @@ type Status struct {
 type WebStatus struct {
 	*Status
 
+	// Override API account with web account.
+	Account *WebAccount `json:"account"`
+
 	// Web version of media
 	// attached to this status.
 	MediaAttachments []*WebAttachment `json:"media_attachments"`
diff --git a/internal/api/util/opengraph.go b/internal/api/util/opengraph.go
index 062151836..094c80021 100644
--- a/internal/api/util/opengraph.go
+++ b/internal/api/util/opengraph.go
@@ -84,7 +84,7 @@ func OGBase(instance *apimodel.InstanceV1) *OGMeta {
 // WithAccount uses the given account to build an ogMeta
 // struct specific to that account. It's suitable for serving
 // at account profile pages.
-func (og *OGMeta) WithAccount(account *apimodel.Account) *OGMeta {
+func (og *OGMeta) WithAccount(account *apimodel.WebAccount) *OGMeta {
 	og.Title = AccountTitle(account, og.SiteName)
 	og.Type = "profile"
 	og.URL = account.URL
@@ -148,7 +148,7 @@ func (og *OGMeta) WithStatus(status *apimodel.WebStatus) *OGMeta {
 }
 
 // AccountTitle parses a page title from account and accountDomain
-func AccountTitle(account *apimodel.Account, accountDomain string) string {
+func AccountTitle(account *apimodel.WebAccount, accountDomain string) string {
 	user := "@" + account.Acct + "@" + accountDomain
 
 	if len(account.DisplayName) == 0 {
diff --git a/internal/api/util/opengraph_test.go b/internal/api/util/opengraph_test.go
index 2ecd6a740..4e94d78ef 100644
--- a/internal/api/util/opengraph_test.go
+++ b/internal/api/util/opengraph_test.go
@@ -51,13 +51,15 @@ func (suite *OpenGraphTestSuite) TestWithAccountWithNote() {
 		Languages:     []string{"en"},
 	})
 
-	accountMeta := baseMeta.WithAccount(&apimodel.Account{
+	acct := &apimodel.Account{
 		Acct:        "example_account",
 		DisplayName: "example person!!",
 		URL:         "https://example.org/@example_account",
 		Note:        "<p>This is my profile, read it and weep! Weep then!</p>",
 		Username:    "example_account",
-	})
+	}
+
+	accountMeta := baseMeta.WithAccount(&apimodel.WebAccount{Account: acct})
 
 	suite.EqualValues(OGMeta{
 		Title:                "example person!!, @example_account@example.org",
@@ -84,13 +86,15 @@ func (suite *OpenGraphTestSuite) TestWithAccountNoNote() {
 		Languages:     []string{"en"},
 	})
 
-	accountMeta := baseMeta.WithAccount(&apimodel.Account{
+	acct := &apimodel.Account{
 		Acct:        "example_account",
 		DisplayName: "example person!!",
 		URL:         "https://example.org/@example_account",
 		Note:        "", // <- empty
 		Username:    "example_account",
-	})
+	}
+
+	accountMeta := baseMeta.WithAccount(&apimodel.WebAccount{Account: acct})
 
 	suite.EqualValues(OGMeta{
 		Title:                "example person!!, @example_account@example.org",