[feature] Web profile pages for accounts (#449)

* add default avatars

* allow webModule to error

* return errWithCode from account get

* add AccountGetLocalByUsername

* check nil requesting account

* add timestampShort function for just month/year

* move loading logic to New + add default avatars

* add profile page view

* update swagger docs

* add excludeReblogs to GetAccountStatuses

* ignore casing when selecting local account by username

* appropriate redirects

* css fiddling

* add 'about' heading

* adjust thread page to work with routing

* return AP representation if requested + authorized

* simplify auth check

* go fmt

* golangci-lint ignore math/rand

3 files changed, 213 insertions, 27 deletions

diff --git a/internal/web/base.go b/internal/web/base.go
index 58afd40a7..fff61043a 100644
--- a/internal/web/base.go
+++ b/internal/web/base.go
@@ -20,8 +20,10 @@ package web
 
 import (
 	"fmt"
+	"io/ioutil"
 	"net/http"
 	"path/filepath"
+	"strings"
 
 	"github.com/gin-gonic/gin"
 	"github.com/sirupsen/logrus"
@@ -36,18 +38,68 @@ import (
 const (
 	confirmEmailPath = "/" + uris.ConfirmEmailPath
 	tokenParam       = "token"
+	usernameKey      = "username"
+	statusIDKey      = "status"
+	profilePath      = "/@:" + usernameKey
+	statusPath       = profilePath + "/statuses/:" + statusIDKey
 )
 
 // Module implements the api.ClientModule interface for web pages.
 type Module struct {
-	processor processing.Processor
+	processor      processing.Processor
+	assetsPath     string
+	adminPath      string
+	defaultAvatars []string
 }
 
 // New returns a new api.ClientModule for web pages.
-func New(processor processing.Processor) api.ClientModule {
-	return &Module{
-		processor: processor,
+func New(processor processing.Processor) (api.ClientModule, error) {
+	assetsBaseDir := viper.GetString(config.Keys.WebAssetBaseDir)
+	if assetsBaseDir == "" {
+		return nil, fmt.Errorf("%s cannot be empty and must be a relative or absolute path", config.Keys.WebAssetBaseDir)
+	}
+
+	assetsPath, err := filepath.Abs(assetsBaseDir)
+	if err != nil {
+		return nil, fmt.Errorf("error getting absolute path of %s: %s", assetsBaseDir, err)
 	}
+
+	defaultAvatarsPath := filepath.Join(assetsPath, "default_avatars")
+	defaultAvatarFiles, err := ioutil.ReadDir(defaultAvatarsPath)
+	if err != nil {
+		return nil, fmt.Errorf("error reading default avatars at %s: %s", defaultAvatarsPath, err)
+	}
+
+	defaultAvatars := []string{}
+	for _, f := range defaultAvatarFiles {
+		// ignore directories
+		if f.IsDir() {
+			continue
+		}
+
+		// ignore files bigger than 50kb
+		if f.Size() > 50000 {
+			continue
+		}
+
+		extension := strings.TrimPrefix(strings.ToLower(filepath.Ext(f.Name())), ".")
+
+		// take only files with simple extensions
+		switch extension {
+		case "svg", "jpeg", "jpg", "gif", "png":
+			defaultAvatarPath := fmt.Sprintf("/assets/default_avatars/%s", f.Name())
+			defaultAvatars = append(defaultAvatars, defaultAvatarPath)
+		default:
+			continue
+		}
+	}
+
+	return &Module{
+		processor:      processor,
+		assetsPath:     assetsPath,
+		adminPath:      filepath.Join(assetsPath, "admin"),
+		defaultAvatars: defaultAvatars,
+	}, nil
 }
 
 func (m *Module) baseHandler(c *gin.Context) {
@@ -88,20 +140,11 @@ func (m *Module) NotFoundHandler(c *gin.Context) {
 // Route satisfies the RESTAPIModule interface
 func (m *Module) Route(s router.Router) error {
 	// serve static files from assets dir at /assets
-	assetBaseDir := viper.GetString(config.Keys.WebAssetBaseDir)
-	if assetBaseDir == "" {
-		return fmt.Errorf("%s cannot be empty and must be a relative or absolute path", config.Keys.WebAssetBaseDir)
-	}
-	assetPath, err := filepath.Abs(assetBaseDir)
-	if err != nil {
-		return fmt.Errorf("error getting absolute path of %s: %s", assetBaseDir, err)
-	}
-	s.AttachStaticFS("/assets", fileSystem{http.Dir(assetPath)})
+	s.AttachStaticFS("/assets", fileSystem{http.Dir(m.assetsPath)})
 
 	// serve admin panel from within assets dir at /admin/
 	// and redirect /admin to /admin/
-	adminPath := filepath.Join(assetPath, "admin")
-	s.AttachStaticFS("/admin/", fileSystem{http.Dir(adminPath)})
+	s.AttachStaticFS("/admin/", fileSystem{http.Dir(m.adminPath)})
 	s.AttachHandler(http.MethodGet, "/admin", func(c *gin.Context) {
 		c.Redirect(http.StatusMovedPermanently, "/admin/")
 	})
@@ -109,8 +152,11 @@ func (m *Module) Route(s router.Router) error {
 	// serve front-page
 	s.AttachHandler(http.MethodGet, "/", m.baseHandler)
 
+	// serve profile pages at /@username
+	s.AttachHandler(http.MethodGet, profilePath, m.profileTemplateHandler)
+
 	// serve statuses
-	s.AttachHandler(http.MethodGet, "/:user/statuses/:id", m.threadTemplateHandler)
+	s.AttachHandler(http.MethodGet, statusPath, m.threadTemplateHandler)
 
 	// serve email confirmation page at /confirm_email?token=whatever
 	s.AttachHandler(http.MethodGet, confirmEmailPath, m.confirmEmailGETHandler)
diff --git a/internal/web/profile.go b/internal/web/profile.go
new file mode 100644
index 000000000..7fad7f4c6
--- /dev/null
+++ b/internal/web/profile.go
@@ -0,0 +1,139 @@
+/*
+   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 web
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"math/rand"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/viper"
+	"github.com/superseriousbusiness/gotosocial/internal/ap"
+	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+)
+
+func (m *Module) profileTemplateHandler(c *gin.Context) {
+	l := logrus.WithField("func", "profileTemplateHandler")
+	l.Trace("rendering profile template")
+	ctx := c.Request.Context()
+
+	username := c.Param(usernameKey)
+	if username == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "no account username specified"})
+		return
+	}
+
+	authed, err := oauth.Authed(c, false, false, false, false)
+	if err != nil {
+		l.Errorf("error authing profile GET request: %s", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "internal server error"})
+		return
+	}
+
+	instance, errWithCode := m.processor.InstanceGet(ctx, viper.GetString(config.Keys.Host))
+	if errWithCode != nil {
+		l.Debugf("error getting instance from processor: %s", errWithCode.Error())
+		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		return
+	}
+
+	account, errWithCode := m.processor.AccountGetLocalByUsername(ctx, authed, username)
+	if errWithCode != nil {
+		l.Debugf("error getting account from processor: %s", errWithCode.Error())
+		if errWithCode.Code() == http.StatusNotFound {
+			m.NotFoundHandler(c)
+			return
+		}
+		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		return
+	}
+
+	// if we're getting an AP request on this endpoint we should render the account's AP representation instead
+	accept := c.NegotiateFormat(string(api.TextHTML), string(api.AppActivityJSON), string(api.AppActivityLDJSON))
+	if accept == string(api.AppActivityJSON) || accept == string(api.AppActivityLDJSON) {
+		m.returnAPRepresentation(ctx, c, username, accept)
+		return
+	}
+
+	// get latest 10 top-level public statuses;
+	// ie., exclude replies and boosts, public only,
+	// with or without media
+	statuses, errWithCode := m.processor.AccountStatusesGet(ctx, authed, account.ID, 10, true, true, "", "", false, false, true)
+	if errWithCode != nil {
+		l.Debugf("error getting statuses from processor: %s", errWithCode.Error())
+		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		return
+	}
+
+	// pick a random dummy avatar if this account avatar isn't set yet
+	if account.Avatar == "" && len(m.defaultAvatars) > 0 {
+		//nolint:gosec
+		randomIndex := rand.Intn(len(m.defaultAvatars))
+		dummyAvatar := m.defaultAvatars[randomIndex]
+		account.Avatar = dummyAvatar
+		for _, s := range statuses {
+			s.Account.Avatar = dummyAvatar
+		}
+	}
+
+	c.HTML(http.StatusOK, "profile.tmpl", gin.H{
+		"instance": instance,
+		"account":  account,
+		"statuses": statuses,
+		"stylesheets": []string{
+			"/assets/Fork-Awesome/css/fork-awesome.min.css",
+			"/assets/status.css",
+			"/assets/profile.css",
+		},
+	})
+}
+
+func (m *Module) returnAPRepresentation(ctx context.Context, c *gin.Context, username string, accept string) {
+	verifier, signed := c.Get(string(ap.ContextRequestingPublicKeyVerifier))
+	if signed {
+		ctx = context.WithValue(ctx, ap.ContextRequestingPublicKeyVerifier, verifier)
+	}
+
+	signature, signed := c.Get(string(ap.ContextRequestingPublicKeySignature))
+	if signed {
+		ctx = context.WithValue(ctx, ap.ContextRequestingPublicKeySignature, signature)
+	}
+
+	user, errWithCode := m.processor.GetFediUser(ctx, username, c.Request.URL) // GetFediUser handles auth as well
+	if errWithCode != nil {
+		logrus.Infof(errWithCode.Error())
+		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		return
+	}
+
+	b, mErr := json.Marshal(user)
+	if mErr != nil {
+		err := fmt.Errorf("could not marshal json: %s", mErr)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.Data(http.StatusOK, accept, b)
+}
diff --git a/internal/web/thread.go b/internal/web/thread.go
index 9c985d729..4a448690d 100644
--- a/internal/web/thread.go
+++ b/internal/web/thread.go
@@ -20,6 +20,7 @@ package web
 
 import (
 	"net/http"
+	"strings"
 
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/viper"
@@ -29,21 +30,21 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/oauth"
 )
 
-type statusLink struct {
-	User string `uri:"user" binding:"required"`
-	ID   string `uri:"id"   binding:"required"`
-}
-
 func (m *Module) threadTemplateHandler(c *gin.Context) {
 	l := logrus.WithField("func", "threadTemplateGET")
 	l.Trace("rendering thread template")
 
 	ctx := c.Request.Context()
 
-	var uriParts statusLink
+	username := c.Param(usernameKey)
+	if username == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "no account username specified"})
+		return
+	}
 
-	if err := c.ShouldBindUri(&uriParts); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "status not found"})
+	statusID := c.Param(statusIDKey)
+	if username == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "no status id specified"})
 		return
 	}
 
@@ -62,18 +63,18 @@ func (m *Module) threadTemplateHandler(c *gin.Context) {
 		return
 	}
 
-	status, err := m.processor.StatusGet(ctx, authed, uriParts.ID)
+	status, err := m.processor.StatusGet(ctx, authed, statusID)
 	if err != nil {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "status not found"})
 		return
 	}
 
-	if uriParts.User[:1] != "@" || uriParts.User[1:] != status.Account.Username {
+	if !strings.EqualFold(username, status.Account.Username) {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "status not found"})
 		return
 	}
 
-	context, err := m.processor.StatusGetContext(ctx, authed, uriParts.ID)
+	context, err := m.processor.StatusGetContext(ctx, authed, statusID)
 	if err != nil {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "status not found"})
 		return