Adding upstream version 9.0.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

1 files changed, 295 insertions, 0 deletions

diff --git a/services/federation/federation_service.go b/services/federation/federation_service.go
new file mode 100644
index 0000000..4c6f5ca
--- /dev/null
+++ b/services/federation/federation_service.go
@@ -0,0 +1,295 @@
+// Copyright 2024 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package federation
+
+import (
+	"context"
+	"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"
+	fm "code.gitea.io/gitea/modules/forgefed"
+	"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.(*fm.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 := GetFederationHostForURI(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 := fm.NewPersonID(actorURI, string(federationHost.NodeInfo.SoftwareName))
+	if err != nil {
+		return http.StatusNotAcceptable, "Invalid PersonID", err
+	}
+	log.Info("Actor accepted:%v", actorID)
+
+	// parse objectID (repository)
+	objectID, err := fm.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 fm.ActorID) (*forgefed.FederationHost, error) {
+	actionsUser := user.NewActionsUser()
+	clientFactory, err := activitypub.GetClientFactory(ctx)
+	if err != nil {
+		return nil, err
+	}
+	client, err := clientFactory.WithKeys(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 GetFederationHostForURI(ctx context.Context, actorURI string) (*forgefed.FederationHost, error) {
+	log.Info("Input was: %v", actorURI)
+	rawActorID, err := fm.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 fm.PersonID, federationHostID int64) (*user.User, *user.FederatedUser, error) {
+	// ToDo: Do we get a publicKeyId from server, repo or owner or repo?
+	actionsUser := user.NewActionsUser()
+	clientFactory, err := activitypub.GetClientFactory(ctx)
+	if err != nil {
+		return nil, nil, err
+	}
+	client, err := clientFactory.WithKeys(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 := fm.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(name),
+		Name:                         name,
+		FullName:                     fullName,
+		Email:                        email,
+		EmailNotificationsPreference: "disabled",
+		Passwd:                       password,
+		MustChangePassword:           false,
+		LoginName:                    loginName,
+		Type:                         user.UserTypeRemoteUser,
+		IsAdmin:                      false,
+		NormalizedFederatedURI:       personID.AsURI(),
+	}
+	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
+}
+
+// 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 {
+		federationHost, err := GetFederationHostForURI(ctx, uri)
+		if err != nil {
+			return http.StatusInternalServerError, "Wrong FederationHost", err
+		}
+		followingRepoID, err := fm.NewRepositoryID(uri, string(federationHost.NodeInfo.SoftwareName))
+		if err != nil {
+			return http.StatusNotAcceptable, "Invalid federated repo", err
+		}
+		followingRepo, err := repo.NewFollowingRepo(localRepoID, followingRepoID.ID, federationHost.ID, uri)
+		if err != nil {
+			return http.StatusNotAcceptable, "Invalid federated repo", err
+		}
+		followingRepos = append(followingRepos, &followingRepo)
+	}
+
+	if err := repo.StoreFollowingRepos(ctx, localRepoID, followingRepos); err != nil {
+		return 0, "", err
+	}
+
+	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([]fm.ForgeLike, 0)
+	for _, followingRepo := range followingRepos {
+		log.Info("Found following repo: %v", followingRepo)
+		target := followingRepo.URI
+		likeActivity, err := fm.NewForgeLike(doer.APActorID(), target, time.Now())
+		if err != nil {
+			return err
+		}
+		likeActivityList = append(likeActivityList, likeActivity)
+	}
+
+	apclientFactory, err := activitypub.GetClientFactory(ctx)
+	if err != nil {
+		return err
+	}
+	apclient, err := apclientFactory.WithKeys(ctx, &doer, doer.APActorID())
+	if err != nil {
+		return err
+	}
+	for i, activity := range likeActivityList {
+		activity.StartTime = activity.StartTime.Add(time.Duration(i) * time.Second)
+		json, err := activity.MarshalJSON()
+		if err != nil {
+			return err
+		}
+
+		_, err = apclient.Post(json, fmt.Sprintf("%v/inbox/", activity.Object))
+		if err != nil {
+			log.Error("error %v while sending activity: %q", err, activity)
+		}
+	}
+
+	return nil
+}