forgejo/services/federation/federation_service.go
Clemens 8cd89bf4d3 added repoUri to federationService
This does not work yet. APAPI url OR host and id have to be derived from repoUri.
2024-04-03 15:39:37 +02:00

351 lines
10 KiB
Go

// Copyright 2024 The Forgejo Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package federation
import (
"context"
"errors"
"fmt"
"net/http"
"net/url"
"strings"
"time"
"code.gitea.io/gitea/models/forgefed"
"code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/activitypub"
"code.gitea.io/gitea/modules/auth/password"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/validation"
"github.com/google/uuid"
)
// ProcessLikeActivity receives a ForgeLike activity and does the following:
// Validation of the activity
// Creation of a (remote) federationHost if not existing
// Creation of a forgefed Person if not existing
// Validation of incoming RepositoryID against Local RepositoryID
// Star the repo if it wasn't already stared
// Do some mitigation against out of order attacks
func ProcessLikeActivity(ctx context.Context, form any, repositoryID int64) (int, string, error) {
activity := form.(*forgefed.ForgeLike)
if res, err := validation.IsValid(activity); !res {
return http.StatusNotAcceptable, "Invalid activity", err
}
log.Info("Activity validated:%v", activity)
// parse actorID (person)
actorURI := activity.Actor.GetID().String()
log.Info("actorURI was: %v", actorURI)
federationHost, err := GetFederationHostFromUri(ctx, actorURI)
if err != nil {
return http.StatusInternalServerError, "Wrong FederationHost", err
}
if !activity.IsNewer(federationHost.LatestActivity) {
return http.StatusNotAcceptable, "Activity out of order.", fmt.Errorf("Activity already processed")
}
actorID, err := forgefed.NewPersonID(actorURI, string(federationHost.NodeInfo.Source))
if err != nil {
return http.StatusNotAcceptable, "Invalid PersonID", err
}
log.Info("Actor accepted:%v", actorID)
// parse objectID (repository)
objectID, err := forgefed.NewRepositoryID(activity.Object.GetID().String(), string(forgefed.ForgejoSourceType))
if err != nil {
return http.StatusNotAcceptable, "Invalid objectId", err
}
if objectID.ID != fmt.Sprint(repositoryID) {
return http.StatusNotAcceptable, "Invalid objectId", err
}
log.Info("Object accepted:%v", objectID)
// Check if user already exists
user, _, err := user.FindFederatedUser(ctx, actorID.ID, federationHost.ID)
if err != nil {
return http.StatusInternalServerError, "Searching for user failed", err
}
if user != nil {
log.Info("Found local federatedUser: %v", user)
} else {
user, _, err = CreateUserFromAP(ctx, actorID, federationHost.ID)
if err != nil {
return http.StatusInternalServerError, "Error creating federatedUser", err
}
log.Info("Created federatedUser from ap: %v", user)
}
log.Info("Got user:%v", user.Name)
// execute the activity if the repo was not stared already
alreadyStared := repo.IsStaring(ctx, user.ID, repositoryID)
if !alreadyStared {
err = repo.StarRepo(ctx, user.ID, repositoryID, true)
if err != nil {
return http.StatusNotAcceptable, "Error staring", err
}
}
federationHost.LatestActivity = activity.StartTime
err = forgefed.UpdateFederationHost(ctx, federationHost)
if err != nil {
return http.StatusNotAcceptable, "Error updating federatedHost", err
}
return 0, "", nil
}
func CreateFederationHostFromAP(ctx context.Context, actorID forgefed.ActorID) (*forgefed.FederationHost, error) {
actionsUser := user.NewActionsUser()
client, err := activitypub.NewClient(ctx, actionsUser, "no idea where to get key material.")
if err != nil {
return nil, err
}
body, err := client.GetBody(actorID.AsWellKnownNodeInfoURI())
if err != nil {
return nil, err
}
nodeInfoWellKnown, err := forgefed.NewNodeInfoWellKnown(body)
if err != nil {
return nil, err
}
body, err = client.GetBody(nodeInfoWellKnown.Href)
if err != nil {
return nil, err
}
nodeInfo, err := forgefed.NewNodeInfo(body)
if err != nil {
return nil, err
}
result, err := forgefed.NewFederationHost(nodeInfo, actorID.Host)
if err != nil {
return nil, err
}
err = forgefed.CreateFederationHost(ctx, &result)
if err != nil {
return nil, err
}
return &result, nil
}
func GetFederationHostFromUri(ctx context.Context, actorURI string) (*forgefed.FederationHost, error) {
// parse actorID (person)
log.Info("Input was: %v", actorURI)
rawActorID, err := forgefed.NewActorID(actorURI)
if err != nil {
return nil, err
}
federationHost, err := forgefed.FindFederationHostByFqdn(ctx, rawActorID.Host)
if err != nil {
return nil, err
}
if federationHost == nil {
result, err := CreateFederationHostFromAP(ctx, rawActorID)
if err != nil {
return nil, err
}
federationHost = result
}
return federationHost, nil
}
func CreateUserFromAP(ctx context.Context, personID forgefed.PersonID, federationHostID int64) (*user.User, *user.FederatedUser, error) {
// ToDo: Do we get a publicKeyId from server, repo or owner or repo?
actionsUser := user.NewActionsUser()
client, err := activitypub.NewClient(ctx, actionsUser, "no idea where to get key material.")
if err != nil {
return nil, nil, err
}
body, err := client.GetBody(personID.AsURI())
if err != nil {
return nil, nil, err
}
person := forgefed.ForgePerson{}
err = person.UnmarshalJSON(body)
if err != nil {
return nil, nil, err
}
if res, err := validation.IsValid(person); !res {
return nil, nil, err
}
log.Info("Fetched valid person:%q", person)
localFqdn, err := url.ParseRequestURI(setting.AppURL)
if err != nil {
return nil, nil, err
}
email := fmt.Sprintf("f%v@%v", uuid.New().String(), localFqdn.Hostname())
loginName := personID.AsLoginName()
name := fmt.Sprintf("%v%v", person.PreferredUsername.String(), personID.HostSuffix())
fullName := person.Name.String()
if len(person.Name) == 0 {
fullName = name
}
password, err := password.Generate(32)
if err != nil {
return nil, nil, err
}
newUser := user.User{
LowerName: strings.ToLower(person.PreferredUsername.String()),
Name: name,
FullName: fullName,
Email: email,
EmailNotificationsPreference: "disabled",
Passwd: password,
MustChangePassword: false,
LoginName: loginName,
Type: user.UserTypeRemoteUser,
IsAdmin: false,
}
federatedUser := user.FederatedUser{
ExternalID: personID.ID,
FederationHostID: federationHostID,
}
err = user.CreateFederatedUser(ctx, &newUser, &federatedUser)
if err != nil {
return nil, nil, err
}
log.Info("Created federatedUser:%q", federatedUser)
return &newUser, &federatedUser, nil
}
// TODO: This needs probably an own struct/value object
// ====================================================
func GetRepoOwnerAndNameFromRepoUri(uri string) (string, string, error) {
path, err := getUriPathFromRepoUri(uri)
if err != nil {
return "", "", err
}
pathSplit := strings.Split(path, "/")
return pathSplit[0], pathSplit[1], nil
}
func GetRepoAPIUriFromRepoUri(uri string) (string, error) {
path, err := getUriPathFromRepoUri(uri)
if err != nil {
return "", err
}
parsedUri, err := url.ParseRequestURI(uri)
if err != nil {
return "", err
}
parsedUri.Path = fmt.Sprintf("%v/%v", "api/v1/repos", path)
return parsedUri.String(), nil
}
func getUriPathFromRepoUri(uri string) (string, error) {
if !IsValidRepoUri(uri) {
return "", errors.New("malformed repository uri")
}
parsedUri, err := url.ParseRequestURI(uri)
if err != nil {
return "", err
}
path := strings.TrimPrefix(parsedUri.Path, "/")
return path, nil
}
// TODO: This belongs into some value object
func IsValidRepoUri(uri string) bool {
parsedUri, err := url.ParseRequestURI(uri)
if err != nil {
return false
}
path := strings.TrimPrefix(parsedUri.Path, "/")
pathSplit := strings.Split(path, "/")
if len(pathSplit) != 2 {
return false
}
for _, part := range pathSplit {
if strings.TrimSpace(part) == "" {
return false
}
}
return true
}
// ====================================================
// Create or update a list of FollowingRepo structs
func StoreFollowingRepoList(ctx context.Context, localRepoId int64, followingRepoList []string) (int, string, error) {
followingRepos := make([]*repo.FollowingRepo, 0, len(followingRepoList))
for _, uri := range followingRepoList {
owner, repoName, err := GetRepoOwnerAndNameFromRepoUri(uri)
if err != nil {
return http.StatusBadRequest, "Malformed Repository URI", err
}
repoApiUri, err := GetRepoAPIUriFromRepoUri(uri)
if err != nil {
return http.StatusBadRequest, "Malformed Repository URI", err
}
log.Info("RepoApiUri: %q", repoApiUri)
// TODO: derive host from repoApiUri or derive APAPI URI from repoApiUri
federationHost, err := GetFederationHostFromUri(ctx, repoApiUri)
if err != nil {
return http.StatusInternalServerError, "Wrong FederationHost", err
}
// TODO: derive id from repoApiUri
followingRepoID, err := forgefed.NewRepositoryID(repoApiUri, string(federationHost.NodeInfo.Source))
if err != nil {
return http.StatusNotAcceptable, "Invalid federated repo", err
}
followingRepo, err := repo.NewFollowingRepo(localRepoId, followingRepoID.ID, federationHost.ID, owner, repoName, uri)
if err != nil {
return http.StatusNotAcceptable, "Invalid federated repo", err
}
followingRepos = append(followingRepos, &followingRepo)
}
repo.StoreFollowingRepos(ctx, localRepoId, followingRepos)
return 0, "", nil
}
func DeleteFollowingRepos(ctx context.Context, localRepoId int64) error {
return repo.StoreFollowingRepos(ctx, localRepoId, []*repo.FollowingRepo{})
}
func SendLikeActivities(ctx context.Context, doer user.User, repoID int64) error {
followingRepos, err := repo.FindFollowingReposByRepoID(ctx, repoID)
log.Info("Federated Repos is: %v", followingRepos)
if err != nil {
return err
}
likeActivityList := make([]forgefed.ForgeLike, 0)
for _, followingRepo := range followingRepos {
target := followingRepo.Uri
likeActivity, err := forgefed.NewForgeLike(doer.APAPIURL(), target, time.Now())
if err != nil {
return err
}
likeActivityList = append(likeActivityList, likeActivity)
}
apclient, err := activitypub.NewClient(ctx, &doer, doer.APAPIURL())
if err != nil {
return err
}
for _, activity := range likeActivityList {
json, err := activity.MarshalJSON()
if err != nil {
return err
}
_, err = apclient.Post([]byte(json), fmt.Sprintf("%v/inbox/", activity.Object))
if err != nil {
log.Error("error %v while sending activity: %q", err, activity)
}
}
return nil
}