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

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.

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.

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"`

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 {

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",

internal/processing/account/get.go

@@ -98,7 +98,7 @@ func (p *Processor) Get(ctx context.Context, requestingAccount *gtsmodel.Account
 }
 
 // GetWeb returns the web model of a local account by username.
-func (p *Processor) GetWeb(ctx context.Context, username string) (*apimodel.Account, gtserror.WithCode) {
+func (p *Processor) GetWeb(ctx context.Context, username string) (*apimodel.WebAccount, gtserror.WithCode) {
 	targetAccount, err := p.state.DB.GetAccountByUsernameDomain(ctx, username, "")
 	if err != nil {
 		if errors.Is(err, db.ErrNoEntries) {

internal/text/emojify.go

@@ -32,20 +32,41 @@ func EmojifyWeb(emojis []apimodel.Emoji, html template.HTML) template.HTML {
 	out := emojify(
 		emojis,
 		string(html),
-		func(url, code string, buf *bytes.Buffer) {
-			buf.WriteString(`<img src="`)
-			buf.WriteString(url)
-			buf.WriteString(`" title=":`)
-			buf.WriteString(code)
-			buf.WriteString(`:" alt=":`)
-			buf.WriteString(code)
-			buf.WriteString(`:" class="emoji" `)
+		func(url, staticURL, code string, buf *bytes.Buffer) {
+			// Open a picture tag so we
+			// can present multiple options.
+			buf.WriteString(`<picture>`)
+
+			// Static version.
+			buf.WriteString(`<source `)
+			{
+				buf.WriteString(`class="emoji" `)
+				buf.WriteString(`srcset="` + staticURL + `" `)
+				buf.WriteString(`type="image/png" `)
+				// Limit size to avoid showing
+				// huge emojis when unstyled.
+				buf.WriteString(`width="25" height="25" `)
+			}
+			buf.WriteString(`/>`)
+
+			// Original image source.
+			buf.WriteString(`<img `)
+			{
+				buf.WriteString(`class="emoji" `)
+				buf.WriteString(`src="` + url + `" `)
+				buf.WriteString(`title=":` + code + `:" `)
+				buf.WriteString(`alt=":` + code + `:" `)
 				// Lazy load emojis when
 				// they scroll into view.
 				buf.WriteString(`loading="lazy" `)
 				// Limit size to avoid showing
 				// huge emojis when unstyled.
-			buf.WriteString(`width="25" height="25"/>`)
+				buf.WriteString(`width="25" height="25" `)
+			}
+			buf.WriteString(`/>`)
+
+			// Close the picture tag.
+			buf.WriteString(`</picture>`)
 		},
 	)
 
@@ -60,17 +81,18 @@ func EmojifyRSS(emojis []apimodel.Emoji, text string) string {
 	return emojify(
 		emojis,
 		text,
-		func(url, code string, buf *bytes.Buffer) {
-			buf.WriteString(`<img src="`)
-			buf.WriteString(url)
-			buf.WriteString(`" title=":`)
-			buf.WriteString(code)
-			buf.WriteString(`:" alt=":`)
-			buf.WriteString(code)
-			buf.WriteString(`:" `)
+		func(url, staticURL, code string, buf *bytes.Buffer) {
+			// Original image source.
+			buf.WriteString(`<img `)
+			{
+				buf.WriteString(`src="` + url + `" `)
+				buf.WriteString(`title=":` + code + `:" `)
+				buf.WriteString(`alt=":` + code + `:" `)
 				// Limit size to avoid showing
 				// huge emojis in RSS readers.
-			buf.WriteString(`width="25" height="25"/>`)
+				buf.WriteString(`width="25" height="25" `)
+			}
+			buf.WriteString(`/>`)
 		},
 	)
 }
@@ -85,7 +107,7 @@ func Demojify(text string) string {
 func emojify(
 	emojis []apimodel.Emoji,
 	input string,
-	write func(url, code string, buf *bytes.Buffer),
+	write func(url, staticURL, code string, buf *bytes.Buffer),
 ) string {
 	// Build map of shortcodes. Normalize each
 	// shortcode by readding closing colons.
@@ -107,10 +129,11 @@ func(shortcode string, buf *bytes.Buffer) string {
 
 			// Escape raw emoji content.
 			url := html.EscapeString(emoji.URL)
+			staticURL := html.EscapeString(emoji.StaticURL)
 			code := html.EscapeString(emoji.Shortcode)
 
 			// Write emoji repr to buffer.
-			write(url, code, buf)
+			write(url, staticURL, code, buf)
 			return buf.String()
 		},
 	)

internal/typeutils/internaltofrontend.go

@@ -170,22 +170,47 @@ func (c *Converter) AccountToAPIAccountPublic(ctx context.Context, a *gtsmodel.A
 func (c *Converter) AccountToWebAccount(
 	ctx context.Context,
 	a *gtsmodel.Account,
-) (*apimodel.Account, error) {
-	webAccount, err := c.AccountToAPIAccountPublic(ctx, a)
+) (*apimodel.WebAccount, error) {
+	apiAccount, err := c.AccountToAPIAccountPublic(ctx, a)
 	if err != nil {
 		return nil, err
 	}
 
+	webAccount := &apimodel.WebAccount{
+		Account: apiAccount,
+	}
+
 	// Set additional avatar information for
-	// serving the avatar in a nice photobox.
-	if a.AvatarMediaAttachment != nil {
-		avatarAttachment, err := c.AttachmentToAPIAttachment(ctx, a.AvatarMediaAttachment)
+	// serving the avatar in a nice <picture>.
+	if ogAvi := a.AvatarMediaAttachment; ogAvi != nil {
+		avatarAttachment, err := c.AttachmentToAPIAttachment(ctx, ogAvi)
 		if err != nil {
 			// This is just extra data so just
 			// log but don't return any error.
 			log.Errorf(ctx, "error converting account avatar attachment: %v", err)
 		} else {
-			webAccount.AvatarAttachment = &avatarAttachment
+			webAccount.AvatarAttachment = &apimodel.WebAttachment{
+				Attachment:      &avatarAttachment,
+				MIMEType:        ogAvi.File.ContentType,
+				PreviewMIMEType: ogAvi.Thumbnail.ContentType,
+			}
+		}
+	}
+
+	// Set additional header information for
+	// serving the header in a nice <picture>.
+	if ogHeader := a.HeaderMediaAttachment; ogHeader != nil {
+		headerAttachment, err := c.AttachmentToAPIAttachment(ctx, ogHeader)
+		if err != nil {
+			// This is just extra data so just
+			// log but don't return any error.
+			log.Errorf(ctx, "error converting account header attachment: %v", err)
+		} else {
+			webAccount.HeaderAttachment = &apimodel.WebAttachment{
+				Attachment:      &headerAttachment,
+				MIMEType:        ogHeader.File.ContentType,
+				PreviewMIMEType: ogHeader.Thumbnail.ContentType,
+			}
 		}
 	}
 
@@ -747,7 +772,15 @@ func (c *Converter) StatusToAPIStatus(
 	filters []*gtsmodel.Filter,
 	mutes *usermute.CompiledUserMuteList,
 ) (*apimodel.Status, error) {
-	apiStatus, err := c.statusToFrontend(ctx, s, requestingAccount, filterContext, filters, mutes)
+	apiStatus, err := c.statusToFrontend(
+		ctx,
+		s,
+		requestingAccount, // Can be nil.
+		filterContext,     // Can be empty.
+		filters,
+		mutes,
+		false, // This is not a web status.
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -958,20 +991,25 @@ func (c *Converter) StatusToWebStatus(
 	ctx context.Context,
 	s *gtsmodel.Status,
 ) (*apimodel.WebStatus, error) {
-	apiStatus, err := c.statusToFrontend(
-		ctx,
-		s,
+	apiStatus, err := c.statusToFrontend(ctx, s,
 		nil,                            // No authed requester.
-		statusfilter.FilterContextNone,
+		statusfilter.FilterContextNone, // No filters.
 		nil,                            // No filters.
 		nil,                            // No mutes.
+		true,                           // Web status.
 	)
 	if err != nil {
 		return nil, err
 	}
 
+	webAccount, err := c.AccountToWebAccount(ctx, s.Account)
+	if err != nil {
+		return nil, err
+	}
+
 	webStatus := &apimodel.WebStatus{
 		Status:  apiStatus,
+		Account: webAccount,
 	}
 
 	// Whack a newline before and after each "pre" to make it easier to outdent it.
@@ -1065,6 +1103,7 @@ func (c *Converter) StatusToWebStatus(
 			Attachment:      apiAttachment,
 			Sensitive:       apiStatus.Sensitive,
 			MIMEType:        ogAttachment.File.ContentType,
+			PreviewMIMEType: ogAttachment.Thumbnail.ContentType,
 		}
 	}
 
@@ -1097,6 +1136,7 @@ func (c *Converter) statusToFrontend(
 	filterContext statusfilter.FilterContext,
 	filters []*gtsmodel.Filter,
 	mutes *usermute.CompiledUserMuteList,
+	web bool,
 ) (
 	*apimodel.Status,
 	error,
@@ -1107,6 +1147,7 @@ func (c *Converter) statusToFrontend(
 		filterContext,
 		filters,
 		mutes,
+		web,
 	)
 	if err != nil {
 		return nil, err
@@ -1119,6 +1160,7 @@ func (c *Converter) statusToFrontend(
 			filterContext,
 			filters,
 			mutes,
+			web,
 		)
 		if errors.Is(err, statusfilter.ErrHideStatus) {
 			// If we'd hide the original status, hide the boost.
@@ -1149,6 +1191,7 @@ func (c *Converter) baseStatusToFrontend(
 	filterContext statusfilter.FilterContext,
 	filters []*gtsmodel.Filter,
 	mutes *usermute.CompiledUserMuteList,
+	web bool,
 ) (
 	*apimodel.Status,
 	error,
@@ -1169,10 +1212,22 @@ func (c *Converter) baseStatusToFrontend(
 		}
 	}
 
-	apiAuthorAccount, err := c.AccountToAPIAccountPublic(ctx, s.Account)
+	var (
+		apiAuthorAccount *apimodel.Account
+		err              error
+	)
+
+	// Only bother converting the author account if
+	// this is an API status and not a web status.
+	//
+	// If it's a web status, the web function will
+	// convert the account into a web account instead.
+	if !web {
+		apiAuthorAccount, err = c.AccountToAPIAccountPublic(ctx, s.Account)
 	if err != nil {
 		return nil, gtserror.Newf("error converting status author: %w", err)
 		}
+	}
 
 	repliesCount, err := c.state.DB.CountStatusReplies(ctx, s.ID)
 	if err != nil {

internal/web/thread.go

@@ -108,7 +108,7 @@ func (m *Module) threadGETHandler(c *gin.Context) {
 	}
 
 	// Ensure status actually belongs to target account.
-	if context.Status.GetAccountID() != targetAccount.ID {
+	if context.Status.Account.ID != targetAccount.ID {
 		err := fmt.Errorf("target account %s does not own status %s", targetUsername, targetStatusID)
 		apiutil.WebErrorHandler(c, gtserror.NewErrorNotFound(err), instanceGet)
 		return

web/source/css/base.css

@@ -187,12 +187,13 @@ input, select, textarea, .input {
 	margin: -0.2em 0.02em 0;
 	object-fit: contain;
 	vertical-align: middle;
-	transition: 0.1s;
 	
+	@media (prefers-reduced-motion: no-preference) {
 		/*
 			Enlarge emojis on hover to give
 			viewer a good look at them.
 		*/
+		transition: 0.1s;
 		&:hover, &:active {
 			transform: scale(2);
 			background-color: $bg;
@@ -201,6 +202,7 @@ input, select, textarea, .input {
 			border-radius: $br-inner;
 		}
 	}
+}
 
 /*
 	Restyle unordered lists; outdent

web/source/css/status.css

@@ -193,14 +193,6 @@ main {
 				font-size: 1rem;
 				line-height: initial;
 			}
-
-			img {
-				max-width: 100%;
-				margin: 5px auto;
-			}
-			img[alt~="!center"] {
-				display: block;
-			}
 		}
 
 		.poll {

web/template/profile.tmpl

@@ -94,6 +94,17 @@
         alt="{{- template "avatarAlt" . -}}"
         title="{{- template "avatarAlt" . -}}"
     >
+        <picture
+            aria-hidden="true"
+        >
+            {{- if .account.AvatarAttachment }}
+            <source
+                class="avatar"
+                srcset="{{- .account.AvatarStatic -}}"
+                type="{{- .account.AvatarAttachment.PreviewMIMEType -}}"
+                media="(prefers-reduced-motion: reduce)"
+            />
+            {{- end }}
             <img
                 class="avatar"
                 src="{{- .account.Avatar -}}"
@@ -102,6 +113,7 @@
                 width="{{- template "avatarWidth" . -}}"
                 height="{{- template "avatarHeight" . -}}"
             />
+        </picture>
     </a>
 </div>
 {{- end }}
@@ -115,11 +127,20 @@
         {{- include "profileMovedTo" . | indent 2 }}
         {{- end }}
         <div class="header-image-wrapper">
+            <picture>
+                {{- if .account.HeaderAttachment }}
+                <source
+                    srcset="{{- .account.HeaderStatic -}}"
+                    type="{{- .account.HeaderAttachment.PreviewMIMEType -}}"
+                    media="(prefers-reduced-motion: reduce)"
+                />
+                {{- end }}
                 <img
                     src="{{- .account.Header -}}"
                     alt="{{- template "headerAlt" . -}}"
                     title="{{- template "headerAlt" . -}}"
                 />
+            </picture>
         </div>
         <div class="basic-info">
             {{- with . }}

web/template/status_header.tmpl

@@ -32,13 +32,23 @@
         title="Open remote profile (opens in a new window)"
     >
     {{- end }}
-        <img
+        <picture
             class="avatar"
             aria-hidden="true"
+        >
+            {{- if .AvatarAttachment }}
+            <source
+                srcset="{{- .AvatarStatic -}}"
+                type="{{- .AvatarAttachment.PreviewMIMEType -}}"
+                media="(prefers-reduced-motion: reduce)"
+            />
+            {{- end }}
+            <img
                 src="{{- .Avatar -}}"
                 alt="Avatar for {{ .Username -}}"
                 title="Avatar for {{ .Username -}}"
             >
+        </picture>
         <div class="author-strap">
             <span class="displayname text-cutoff">
                 {{- if .DisplayName -}}