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package server
import (
"encoding/json"
"fmt"
"github.com/gorilla/mux"
"net/http"
"regexp"
"rss_parrot/dto"
"rss_parrot/logic"
"rss_parrot/shared"
)
// Groups together the handlers needed to implement an ActivityPub server.
type apubHandlerGroup struct {
cfg *shared.Config
logger shared.ILogger
metrics logic.IMetrics
sender logic.IActivitySender
sigChecker logic.IHttpSigChecker
udir logic.IUserDirectory
inbox logic.IInbox
reResource *regexp.Regexp
}
func NewApubHandlerGroup(
cfg *shared.Config,
logger shared.ILogger,
metrics logic.IMetrics,
sender logic.IActivitySender,
sigChecker logic.IHttpSigChecker,
udir logic.IUserDirectory,
ibox logic.IInbox,
) IHandlerGroup {
res := apubHandlerGroup{
cfg: cfg,
logger: logger,
metrics: metrics,
sender: sender,
sigChecker: sigChecker,
udir: udir,
inbox: ibox,
}
res.reResource = regexp.MustCompile("^acct:([^@]+)@([^@]+)$")
return &res
}
func (hg *apubHandlerGroup) Prefix() string {
return ""
}
func (hg *apubHandlerGroup) GroupDefs() []handlerDef {
return []handlerDef{
{"GET", "/.well-known/webfinger", func(w http.ResponseWriter, r *http.Request) { hg.getWebfinger(w, r) }},
{"GET", "/u/{user}", func(w http.ResponseWriter, r *http.Request) { hg.getUser(w, r) }},
{"GET", "/u/{user}/outbox", func(w http.ResponseWriter, r *http.Request) { hg.getUserOutbox(w, r) }},
{"GET", "/u/{user}/followers", func(w http.ResponseWriter, r *http.Request) { hg.getUserFollowers(w, r) }},
{"GET", "/u/{user}/following", func(w http.ResponseWriter, r *http.Request) { hg.getUserFollowing(w, r) }},
{"GET", "/u/{user}/status/{id}", func(w http.ResponseWriter, r *http.Request) { hg.getUserStatus(w, r) }},
{"POST", "/u/{user}/inbox", func(w http.ResponseWriter, r *http.Request) { hg.postInbox(w, r) }},
{"POST", "/inbox", func(w http.ResponseWriter, r *http.Request) { hg.postInbox(w, r) }},
}
}
func (hg *apubHandlerGroup) AuthMW() func(next http.Handler) http.Handler {
return emptyMW
}
func (hg *apubHandlerGroup) getWebfinger(w http.ResponseWriter, r *http.Request) {
hg.logger.Infof("Handling webfinger GET: %s", r.URL.Path)
obs := hg.metrics.StartApubRequestIn("webfinger")
defer obs.Finish()
resourceParam := r.URL.Query().Get("resource")
groups := hg.reResource.FindStringSubmatch(resourceParam)
if groups == nil {
hg.logger.Infof("Webfinger: Invalid request; 'resource' param is '%s'", resourceParam)
writeErrorResponse(w, "Missing or invalid 'resource' param", http.StatusBadRequest)
return
}
user, host := groups[1], groups[2]
_ = host // TODO check is host for us?
resp := hg.udir.GetWebfinger(user)
if resp == nil {
hg.logger.Infof("Webfinger: No such resource; 'resource' param is '%s'", resourceParam)
writeErrorResponse(w, "No such resource", http.StatusNotFound)
return
}
writeJsonResponse(hg.logger, w, rtJrdJson, resp)
}
func (hg *apubHandlerGroup) getUser(w http.ResponseWriter, r *http.Request) {
hg.logger.Infof("Handling user GET: %s", r.URL.Path)
obs := hg.metrics.StartApubRequestIn("user")
defer obs.Finish()
userName := mux.Vars(r)["user"]
if !acceptsJson(r) {
idb := shared.IdBuilder{Host: hg.cfg.Host}
profileUrl := idb.UserProfile(userName)
hg.logger.Infof("No application/json in accept header; redirecting to: '%s'", profileUrl)
http.Redirect(w, r, profileUrl, http.StatusSeeOther)
return
}
userInfo := hg.udir.GetUserInfo(userName)
if userInfo == nil {
hg.logger.Infof("Info requested for unknown user: '%s'", userName)
writeErrorResponse(w, "No such user", http.StatusNotFound)
return
}
writeJsonResponse(hg.logger, w, rtActivityJson, userInfo)
}
func (hg *apubHandlerGroup) getUserStatus(w http.ResponseWriter, r *http.Request) {
hg.logger.Infof("Handling user status GET: %s", r.URL.Path)
obs := hg.metrics.StartApubRequestIn("user/status")
defer obs.Finish()
userName := mux.Vars(r)["user"]
statusId := mux.Vars(r)["id"]
if !acceptsJson(r) {
idb := shared.IdBuilder{Host: hg.cfg.Host}
profileUrl := idb.UserProfile(userName)
hg.logger.Infof("No application/json in accept header; redirecting to: '%s'", profileUrl)
http.Redirect(w, r, profileUrl, http.StatusSeeOther)
return
}
var err error
var note *dto.Note
if note, err = hg.udir.GetUserStatus(userName, statusId); err != nil {
hg.logger.Infof("Error retrieving status %s/%s: %v", userName, statusId, err)
writeErrorResponse(w, internalErrorStr, http.StatusInternalServerError)
return
}
if note == nil {
hg.logger.Infof("User status not found: %s/%s", userName, statusId)
writeErrorResponse(w, "User or status not found", http.StatusNotFound)
return
}
note.Context = "https://www.w3.org/ns/activitystreams"
writeJsonResponse(hg.logger, w, rtActivityJson, note)
}
func (hg *apubHandlerGroup) getUserOutbox(w http.ResponseWriter, r *http.Request) {
hg.logger.Infof("Handling user outbox GET: %s", r.URL.Path)
obs := hg.metrics.StartApubRequestIn("user/outbox")
defer obs.Finish()
userName := mux.Vars(r)["user"]
summary := hg.udir.GetOutboxSummary(userName)
if summary == nil {
hg.logger.Infof("Outbox requested for unknown user: '%s'", userName)
writeErrorResponse(w, "No such user", http.StatusNotFound)
return
}
writeJsonResponse(hg.logger, w, rtActivityJson, summary)
}
func (hg *apubHandlerGroup) getUserFollowers(w http.ResponseWriter, r *http.Request) {
hg.logger.Infof("Handling user followers GET: %s", r.URL.Path)
obs := hg.metrics.StartApubRequestIn("user/followers")
defer obs.Finish()
userName := mux.Vars(r)["user"]
summary := hg.udir.GetFollowersSummary(userName)
if summary == nil {
hg.logger.Infof("Followers requested for unknown user: '%s'", userName)
writeErrorResponse(w, "No such user", http.StatusNotFound)
return
}
writeJsonResponse(hg.logger, w, rtActivityJson, summary)
}
func (hg *apubHandlerGroup) getUserFollowing(w http.ResponseWriter, r *http.Request) {
hg.logger.Infof("Handling user following GET: %s", r.URL.Path)
obs := hg.metrics.StartApubRequestIn("user/following")
defer obs.Finish()
userName := mux.Vars(r)["user"]
summary := hg.udir.GetFollowingSummary(userName)
if summary == nil {
hg.logger.Infof("Following requested for unknown user: '%s'", userName)
writeErrorResponse(w, "No such user", http.StatusNotFound)
return
}
writeJsonResponse(hg.logger, w, rtActivityJson, summary)
}
func (hg *apubHandlerGroup) postInbox(w http.ResponseWriter, r *http.Request) {
var err error
hg.logger.Infof("Handling user inbox POST: %s", r.URL.Path)
userName := mux.Vars(r)["user"]
if userName == "" {
obs := hg.metrics.StartApubRequestIn("inbox")
defer obs.Finish()
} else {
obs := hg.metrics.StartApubRequestIn("user/inbox")
defer obs.Finish()
}
bodyBytes := readBody(hg.logger, w, r)
if bodyBytes == nil {
hg.logger.Info("Empty request body")
writeErrorResponse(w, "Request body must not be empty", http.StatusBadRequest)
return
}
// DBG
//hg.logger.Debug(string(bodyBytes))
// First, parse a rudimentary version of the activity to check signature, find out activity type
var act dto.ActivityInBase
if err = json.Unmarshal(bodyBytes, &act); err != nil {
hg.logger.Infof("Invalid JSON in request body: %v: %s", err, string(bodyBytes))
writeErrorResponse(w, "Request body is not valid JSON", http.StatusBadRequest)
return
}
// Verify signature
var senderInfo *dto.UserInfo
var sigProblem string
senderInfo, sigProblem, err = hg.sigChecker.Check(act.Actor, w, r)
if err != nil {
hg.logger.Errorf("Unexpected error trying to verify signature: %v", err)
writeErrorResponse(w, internalErrorStr, http.StatusInternalServerError)
return
}
if sigProblem != "" {
if act.Type == "Delete" {
hg.logger.Infof("Ignoring Delete request with unverified actor signature")
writeJsonResponse(hg.logger, w, rtActivityJson, "OK")
} else {
hg.logger.Warnf("Incorrectly signed inbox POST request: %s", sigProblem)
msg := fmt.Sprintf("Invalid HTTP signature: %s", sigProblem)
writeErrorResponse(w, msg, http.StatusUnauthorized)
}
return
}
hg.processActivity(userName, bodyBytes, senderInfo, act, w)
}
func (hg *apubHandlerGroup) processActivity(
userName string,
bodyBytes []byte,
senderInfo *dto.UserInfo,
act dto.ActivityInBase,
w http.ResponseWriter,
) {
var err error
// Find out Object's type if object field is, well, an object
// If yes, grab object type field
objectType := ""
if objMap, ok := act.Object.(map[string]interface{}); ok {
if objTypeStr, ok := objMap["type"].(string); ok {
objectType = objTypeStr
}
}
// Handle different activities
var reqProblem string
if act.Type == "Follow" {
reqProblem, err = hg.inbox.HandleFollow(userName, senderInfo, bodyBytes)
} else if act.Type == "Undo" {
reqProblem, err = hg.inbox.HandleUndo(userName, senderInfo, bodyBytes)
} else if act.Type == "Create" {
if objectType == "Note" {
reqProblem, err = hg.inbox.HandleCreateNote(act, senderInfo, bodyBytes)
}
}
if err != nil {
hg.logger.Errorf("Error handling inbox activity: %v", err)
writeErrorResponse(w, internalErrorStr, http.StatusInternalServerError)
return
}
if reqProblem != "" {
hg.logger.Infof("Invalid '%s' request: %s", act.Type, reqProblem)
msg := fmt.Sprintf("Bad request: %s", reqProblem)
writeErrorResponse(w, msg, http.StatusBadRequest)
return
}
writeJsonResponse(hg.logger, w, rtActivityJson, "OK")
}
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