feat(canvas): add interactive resource views and team avatars (#12160)

app/Http/Controllers/Api/Concerns/HandlesTagsApi.php

@@ -121,8 +121,8 @@ trait HandlesTagsApi
             return response()->json(['message' => 'Tag not found on resource.'], 404);
         }
 
+        // The tag stays, also without resources.
         $resource->tags()->detach($tag->id);
-        $tag->deleteIfOrphaned();
 
         return response()->json(['message' => 'Tag removed.']);
     }

app/Http/Controllers/Api/EnvironmentCanvasController.php

@@ -0,0 +1,264 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Models\Environment;
+use App\Models\Project;
+use App\Models\ResourceLink;
+use App\Services\EnvironmentCanvas;
+use Illuminate\Contracts\Validation\Validator as ValidatorContract;
+use Illuminate\Database\UniqueConstraintViolationException;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Validator;
+
+/**
+ * Environment canvas: a view of one environment's resources with saved card positions and visual-only links.
+ */
+class EnvironmentCanvasController extends Controller
+{
+    private const MAX_POSITIONS = 1000;
+
+    public function __construct(private EnvironmentCanvas $canvas) {}
+
+    public function show(Request $request): JsonResponse
+    {
+        $environment = $this->findEnvironment($request);
+        if ($environment instanceof JsonResponse) {
+            return $environment;
+        }
+        $this->authorize('view', $environment);
+
+        $user = $request->user();
+        $token = $user->currentAccessToken();
+        $canEdit = $user->isAdminOfTeam((int) $environment->project->team_id)
+            && ($token->can('root') || $token->can('write'));
+
+        return response()->json($this->canvas->payload(
+            $environment,
+            canReadSensitive: (bool) $request->attributes->get('can_read_sensitive', false),
+            canEdit: $canEdit,
+        ));
+    }
+
+    public function updatePositions(Request $request): JsonResponse
+    {
+        $environment = $this->findEnvironment($request);
+        if ($environment instanceof JsonResponse) {
+            return $environment;
+        }
+        $this->authorize('update', $environment);
+
+        $return = validateIncomingRequest($request);
+        if ($return instanceof JsonResponse) {
+            return $return;
+        }
+        $validator = Validator::make($request->all(), [
+            'positions' => ['present', 'array', 'max:'.self::MAX_POSITIONS],
+        ]);
+        if ($response = $this->validationFailedResponse($request, $validator, ['positions'])) {
+            return $response;
+        }
+
+        $nodeUuids = $this->canvas->resourceIndex($environment)->keys()->all();
+        $positions = collect($request->input('positions'))->only($nodeUuids)->all();
+
+        $coordinateRule = ['required', 'integer', 'between:-'.EnvironmentCanvas::MAX_COORDINATE.','.EnvironmentCanvas::MAX_COORDINATE];
+        $validator = Validator::make(['positions' => $positions], [
+            'positions.*' => ['required', 'array'],
+            'positions.*.x' => $coordinateRule,
+            'positions.*.y' => $coordinateRule,
+        ]);
+        if ($validator->fails()) {
+            return response()->json([
+                'message' => 'Validation failed.',
+                'errors' => $validator->errors(),
+            ], 422);
+        }
+
+        $saved = DB::transaction(function () use ($environment, $positions, $nodeUuids) {
+            $locked = Environment::query()->lockForUpdate()->findOrFail($environment->id);
+            $merged = $this->canvas->filterPositions(
+                array_merge($locked->canvas_positions ?? [], $positions),
+                $nodeUuids,
+            );
+            $locked->canvas_positions = $merged;
+            $locked->save();
+
+            return $merged;
+        });
+
+        return response()->json(['positions' => (object) $saved]);
+    }
+
+    public function storeLink(Request $request): JsonResponse
+    {
+        $environment = $this->findEnvironment($request);
+        if ($environment instanceof JsonResponse) {
+            return $environment;
+        }
+        $this->authorize('update', $environment);
+
+        $return = validateIncomingRequest($request);
+        if ($return instanceof JsonResponse) {
+            return $return;
+        }
+        $validator = Validator::make($request->all(), [
+            'source' => ['required', 'string', 'max:255'],
+            'target' => ['required', 'string', 'max:255', 'different:source'],
+            'label' => ['nullable', 'string', 'max:64'],
+        ]);
+        if ($response = $this->validationFailedResponse($request, $validator, ['source', 'target', 'label'])) {
+            return $response;
+        }
+
+        $resources = $this->canvas->resourceIndex($environment);
+        $source = $resources->get($request->input('source'));
+        $target = $resources->get($request->input('target'));
+        $errors = [];
+        if (! $source) {
+            $errors['source'] = ['The source must be a resource of this environment.'];
+        }
+        if (! $target) {
+            $errors['target'] = ['The target must be a resource of this environment.'];
+        }
+        if ($errors !== []) {
+            return response()->json(['message' => 'Validation failed.', 'errors' => $errors], 422);
+        }
+
+        $attributes = [
+            'environment_id' => $environment->id,
+            'source_type' => $source['type'],
+            'source_id' => $source['id'],
+            'target_type' => $target['type'],
+            'target_id' => $target['id'],
+        ];
+        $duplicate = ['message' => 'Validation failed.', 'errors' => ['target' => ['These resources are already linked.']]];
+        if (ResourceLink::query()->where($attributes)->exists()) {
+            return response()->json($duplicate, 422);
+        }
+
+        try {
+            $link = ResourceLink::create($attributes + [
+                'label' => $this->normalizeLabel($request->input('label')),
+                'created_by' => $request->user()->id,
+            ]);
+        } catch (UniqueConstraintViolationException) {
+            return response()->json($duplicate, 422);
+        }
+
+        return response()->json(
+            $this->canvas->linkPayload($link, $request->input('source'), $request->input('target')),
+            201,
+        );
+    }
+
+    public function updateLink(Request $request): JsonResponse
+    {
+        $environment = $this->findEnvironment($request);
+        if ($environment instanceof JsonResponse) {
+            return $environment;
+        }
+        $this->authorize('update', $environment);
+
+        $return = validateIncomingRequest($request);
+        if ($return instanceof JsonResponse) {
+            return $return;
+        }
+        $validator = Validator::make($request->all(), [
+            'label' => ['present', 'nullable', 'string', 'max:64'],
+        ]);
+        if ($response = $this->validationFailedResponse($request, $validator, ['label'])) {
+            return $response;
+        }
+
+        $link = $environment->resourceLinks()->whereUuid($request->route('link_uuid'))->first();
+        if (! $link) {
+            return response()->json(['message' => 'Link not found.'], 404);
+        }
+        $resources = $this->canvas->resourceIndex($environment);
+        $uuidOf = fn (string $type, int $id) => $resources->search(fn (array $resource) => $resource['type'] === $type && $resource['id'] === $id);
+        $sourceUuid = $uuidOf($link->source_type, (int) $link->source_id);
+        $targetUuid = $uuidOf($link->target_type, (int) $link->target_id);
+        if ($sourceUuid === false || $targetUuid === false) {
+            return response()->json(['message' => 'Link not found.'], 404);
+        }
+
+        $link->update(['label' => $this->normalizeLabel($request->input('label'))]);
+
+        return response()->json($this->canvas->linkPayload($link, $sourceUuid, $targetUuid));
+    }
+
+    public function destroyLink(Request $request): JsonResponse
+    {
+        $environment = $this->findEnvironment($request);
+        if ($environment instanceof JsonResponse) {
+            return $environment;
+        }
+        $this->authorize('update', $environment);
+
+        $link = $environment->resourceLinks()->whereUuid($request->route('link_uuid'))->first();
+        if (! $link) {
+            return response()->json(['message' => 'Link not found.'], 404);
+        }
+        $link->delete();
+
+        return response()->json(['message' => 'Link deleted.']);
+    }
+
+    /**
+     * The environment of the request, within a project of the token's team.
+     */
+    private function findEnvironment(Request $request): Environment|JsonResponse
+    {
+        $teamId = getTeamIdFromToken();
+        if (is_null($teamId)) {
+            return invalidTokenResponse();
+        }
+
+        $project = Project::whereTeamId($teamId)->whereUuid($request->route('uuid'))->first();
+        if (! $project) {
+            return response()->json(['message' => 'Project not found.'], 404);
+        }
+
+        $environmentNameOrUuid = $request->route('environment_name_or_uuid');
+        $environment = $project->environments()->whereName($environmentNameOrUuid)->first()
+            ?? $project->environments()->whereUuid($environmentNameOrUuid)->first();
+        if (! $environment) {
+            return response()->json(['message' => 'Environment not found.'], 404);
+        }
+        $environment->setRelation('project', $project);
+
+        return $environment;
+    }
+
+    /**
+     * @param  array<int, string>  $allowedFields
+     */
+    private function validationFailedResponse(Request $request, ValidatorContract $validator, array $allowedFields): ?JsonResponse
+    {
+        $extraFields = array_diff(array_keys($request->all()), $allowedFields);
+        if (! $validator->fails() && empty($extraFields)) {
+            return null;
+        }
+
+        $errors = $validator->errors();
+        foreach ($extraFields as $field) {
+            $errors->add($field, 'This field is not allowed.');
+        }
+
+        return response()->json([
+            'message' => 'Validation failed.',
+            'errors' => $errors,
+        ], 422);
+    }
+
+    private function normalizeLabel(mixed $label): ?string
+    {
+        $label = trim((string) $label);
+
+        return $label === '' ? null : $label;
+    }
+}

app/Http/Controllers/Api/ProjectCanvasController.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Models\Project;
+use App\Services\ProjectCanvas;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+/**
+ * Project canvas: the resources of every environment of one project (or of every project).
+ * Moves and links are saved through EnvironmentCanvasController. Called by resources/js/environment-canvas.js through the /canvas/api session bridge.
+ */
+class ProjectCanvasController extends Controller
+{
+    public function __construct(private ProjectCanvas $canvas) {}
+
+    public function index(Request $request): JsonResponse
+    {
+        $teamId = getTeamIdFromToken();
+        if (is_null($teamId)) {
+            return invalidTokenResponse();
+        }
+
+        return response()->json($this->canvas->teamPayload((int) $teamId, (bool) $request->attributes->get('can_read_sensitive', false), $this->canEdit($request, (int) $teamId)));
+    }
+
+    public function show(Request $request, string $uuid): JsonResponse
+    {
+        $teamId = getTeamIdFromToken();
+        if (is_null($teamId)) {
+            return invalidTokenResponse();
+        }
+        $project = Project::query()->whereTeamId($teamId)->whereUuid($uuid)->first();
+        if (! $project) {
+            return response()->json(['message' => 'Project not found.'], 404);
+        }
+        $this->authorize('view', $project);
+
+        return response()->json($this->canvas->payload($project, (bool) $request->attributes->get('can_read_sensitive', false), $this->canEdit($request, (int) $project->team_id)));
+    }
+
+    /**
+     * Same rule as the environment canvas: team admins with a write token move cards and draw links.
+     */
+    private function canEdit(Request $request, int $teamId): bool
+    {
+        $user = $request->user();
+        $token = $user->currentAccessToken();
+
+        return $user->isAdminOfTeam($teamId) && ($token->can('root') || $token->can('write'));
+    }
+}

app/Http/Controllers/Api/ServerCanvasController.php

@@ -0,0 +1,80 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Models\Server;
+use App\Services\ServerCanvas;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+/**
+ * Server canvas: every server of the team (or one server) with the resources on it.
+ * Moves and links are saved through EnvironmentCanvasController. Called by resources/js/environment-canvas.js through the /canvas/api session bridge.
+ */
+class ServerCanvasController extends Controller
+{
+    public function __construct(private ServerCanvas $canvas) {}
+
+    public function index(Request $request): JsonResponse
+    {
+        $teamId = getTeamIdFromToken();
+        if (is_null($teamId)) {
+            return invalidTokenResponse();
+        }
+        $this->authorize('viewAny', Server::class);
+
+        $servers = Server::query()->whereTeamId($teamId)->with('settings')->orderBy('name')->get();
+
+        return response()->json($this->canvas->payload($teamId, $servers, null, $this->canReadSensitive($request), $this->canEdit($request, $teamId)));
+    }
+
+    public function show(Request $request, string $uuid): JsonResponse
+    {
+        $teamId = getTeamIdFromToken();
+        if (is_null($teamId)) {
+            return invalidTokenResponse();
+        }
+        $server = Server::query()->whereTeamId($teamId)->whereUuid($uuid)->with('settings')->first();
+        if (! $server) {
+            return response()->json(['message' => 'Server not found.'], 404);
+        }
+        $this->authorize('view', $server);
+
+        return response()->json($this->canvas->payload($teamId, collect([$server]), $server, $this->canReadSensitive($request), $this->canEdit($request, $teamId)));
+    }
+
+    /**
+     * Same rule as the environment canvas: team admins with a write token move cards and draw links.
+     */
+    private function canEdit(Request $request, int $teamId): bool
+    {
+        $user = $request->user();
+        $token = $user->currentAccessToken();
+
+        return $user->isAdminOfTeam($teamId) && ($token->can('root') || $token->can('write'));
+    }
+
+    /**
+     * Unmanaged Docker containers of one server, as read-only cards for its canvas.
+     */
+    public function containers(string $uuid): JsonResponse
+    {
+        $teamId = getTeamIdFromToken();
+        if (is_null($teamId)) {
+            return invalidTokenResponse();
+        }
+        $server = Server::query()->whereTeamId($teamId)->whereUuid($uuid)->with('settings')->first();
+        if (! $server) {
+            return response()->json(['message' => 'Server not found.'], 404);
+        }
+        $this->authorize('view', $server);
+
+        return response()->json(['nodes' => $this->canvas->unmanagedContainerNodes($server)->all()]);
+    }
+
+    private function canReadSensitive(Request $request): bool
+    {
+        return (bool) $request->attributes->get('can_read_sensitive', false);
+    }
+}

app/Http/Controllers/Api/SharedVariableCanvasController.php

@@ -0,0 +1,199 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Models\Application;
+use App\Models\Environment;
+use App\Models\EnvironmentVariable;
+use App\Models\Project;
+use App\Models\Server;
+use App\Models\Service;
+use App\Models\SharedEnvironmentVariable;
+use App\Models\Team;
+use App\Services\SharedVariableCanvas;
+use App\Traits\EnvironmentVariableProtection;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Validator;
+
+/**
+ * Shared variables canvas: shows which resources use the shared variables of a scope, and adds
+ * a shared variable to a resource (a resource variable that holds {{scope.KEY}}) or removes it.
+ * Called by resources/js/environment-canvas.js through the /canvas/api session bridge.
+ */
+class SharedVariableCanvasController extends Controller
+{
+    use EnvironmentVariableProtection;
+
+    public function __construct(private SharedVariableCanvas $canvas) {}
+
+    public function show(Request $request): JsonResponse
+    {
+        $scope = $this->scope($request);
+        $owner = $this->findOwner($scope, $request->route('uuid'));
+        if ($owner instanceof JsonResponse) {
+            return $owner;
+        }
+        $this->authorize('view', $owner);
+
+        return response()->json($this->canvas->payload($scope, $owner, $this->canEdit($request, $scope, $owner)));
+    }
+
+    public function storeLink(Request $request): JsonResponse
+    {
+        $scope = $this->scope($request);
+        $owner = $this->findOwner($scope, $request->route('uuid'));
+        if ($owner instanceof JsonResponse) {
+            return $owner;
+        }
+        $this->authorize('view', $owner);
+
+        $return = validateIncomingRequest($request);
+        if ($return instanceof JsonResponse) {
+            return $return;
+        }
+        $validator = Validator::make($request->all(), [
+            'source' => ['required', 'string', 'max:255'],
+            'target' => ['required', 'string', 'max:255'],
+        ]);
+        if ($validator->fails()) {
+            return response()->json(['message' => 'Validation failed.', 'errors' => $validator->errors()], 422);
+        }
+
+        $variable = $this->findVariable($owner, $request->input('source'));
+        $resource = $this->canvas->resources($scope, $owner)->get($request->input('target'));
+        $errors = [];
+        if (! $variable) {
+            $errors['source'] = ['The source must be a shared variable of this scope.'];
+        }
+        if (! $resource) {
+            $errors['target'] = ['The target must be a resource that can use this shared variable.'];
+        }
+        if ($errors !== []) {
+            return response()->json(['message' => 'Validation failed.', 'errors' => $errors], 422);
+        }
+        $this->authorize('manageEnvironment', $resource);
+
+        $existing = $this->canvas->resourceVariables(collect([$resource]))->firstWhere('key', $variable->key);
+        if ($existing) {
+            $message = in_array($variable->key, $this->canvas->referencedKeys($scope, $existing->value), true)
+                ? "{$resource->name} already uses {$variable->key}."
+                : "{$resource->name} already has a variable named {$variable->key}. Rename or remove it first.";
+
+            return response()->json(['message' => $message, 'errors' => ['target' => [$message]]], 422);
+        }
+
+        $environmentVariable = new EnvironmentVariable;
+        $environmentVariable->key = $variable->key;
+        $environmentVariable->value = $this->canvas->reference($scope, $variable->key);
+        $environmentVariable->is_multiline = (bool) $variable->is_multiline;
+        $environmentVariable->is_literal = (bool) $variable->is_literal;
+        $environmentVariable->resourceable_id = $resource->getKey();
+        $environmentVariable->resourceable_type = $resource->getMorphClass();
+        $environmentVariable->save();
+
+        $link = collect($this->canvas->links($scope, collect([$variable]), collect([$resource->uuid => $resource])))
+            ->firstWhere('source', $this->canvas->variableNodeId($variable));
+
+        return response()->json($link, 201);
+    }
+
+    public function destroyLink(Request $request): JsonResponse
+    {
+        $scope = $this->scope($request);
+        $owner = $this->findOwner($scope, $request->route('uuid'));
+        if ($owner instanceof JsonResponse) {
+            return $owner;
+        }
+        $this->authorize('view', $owner);
+
+        [$source, $target] = array_pad(explode('|', (string) $request->route('link_id'), 2), 2, '');
+        $resource = $this->canvas->resources($scope, $owner)->get($target);
+        $variable = $this->findVariable($owner, $source);
+        $key = $variable?->key ?? (str_starts_with($source, 'missing:') ? substr($source, strlen('missing:')) : null);
+        if (! $resource || blank($key)) {
+            return response()->json(['message' => 'Link not found.'], 404);
+        }
+        $this->authorize('manageEnvironment', $resource);
+
+        // Preview copies of application variables are removed together with the variable.
+        $references = EnvironmentVariable::query()
+            ->where('resourceable_type', $resource->getMorphClass())
+            ->where('resourceable_id', $resource->getKey())
+            ->get()
+            ->filter(fn (EnvironmentVariable $environmentVariable) => in_array($key, $this->canvas->referencedKeys($scope, $environmentVariable->value), true));
+        if ($references->where('is_preview', false)->isEmpty()) {
+            return response()->json(['message' => 'Link not found.'], 404);
+        }
+        $embedded = $references->reject(fn (EnvironmentVariable $environmentVariable) => $this->canvas->isExactReference($scope, $key, $environmentVariable->value));
+        if ($embedded->isNotEmpty()) {
+            $message = "{$embedded->pluck('key')->unique()->join(', ')} on {$resource->name} uses {$this->canvas->reference($scope, $key)} inside a longer value. Edit it on the resource.";
+
+            return response()->json(['message' => $message], 422);
+        }
+        if ($this->usesDockerCompose($resource)) {
+            foreach ($references->pluck('key')->unique() as $environmentKey) {
+                [$isUsed, $reason] = $this->isEnvironmentVariableUsedInDockerCompose($environmentKey, $resource->docker_compose);
+                if ($isUsed) {
+                    return response()->json(['message' => "Cannot remove {$environmentKey} from {$resource->name}. {$reason}"], 422);
+                }
+            }
+        }
+
+        DB::transaction(fn () => $references->each->delete());
+
+        return response()->json(['message' => 'Link removed.']);
+    }
+
+    /**
+     * The team routes have no {scope} segment.
+     */
+    private function scope(Request $request): string
+    {
+        return $request->route('scope') ?? 'team';
+    }
+
+    private function findOwner(string $scope, ?string $uuid): Model|JsonResponse
+    {
+        $teamId = getTeamIdFromToken();
+        if (is_null($teamId)) {
+            return invalidTokenResponse();
+        }
+        $owner = match ($scope) {
+            'team' => Team::query()->find($teamId),
+            'project' => Project::query()->where('team_id', $teamId)->where('uuid', $uuid)->first(),
+            'environment' => Environment::query()->where('uuid', $uuid)->whereHas('project', fn ($query) => $query->where('team_id', $teamId))->with('project')->first(),
+            'server' => Server::query()->where('team_id', $teamId)->where('uuid', $uuid)->first(),
+            default => null,
+        };
+
+        return $owner ?? response()->json(['message' => str($scope)->headline().' not found.'], 404);
+    }
+
+    private function findVariable(Model $owner, ?string $nodeId): ?SharedEnvironmentVariable
+    {
+        if (! str_starts_with((string) $nodeId, 'variable:')) {
+            return null;
+        }
+
+        return $owner->environment_variables()->whereKey((int) substr($nodeId, strlen('variable:')))->first();
+    }
+
+    private function canEdit(Request $request, string $scope, Model $owner): bool
+    {
+        $user = $request->user();
+        $token = $user->currentAccessToken();
+
+        return $user->isAdminOfTeam($this->canvas->teamId($scope, $owner))
+            && ($token->can('root') || $token->can('write'));
+    }
+
+    private function usesDockerCompose(Model $resource): bool
+    {
+        return $resource instanceof Service
+            || ($resource instanceof Application && $resource->build_pack === 'dockercompose');
+    }
+}

app/Http/Controllers/Api/TagCanvasController.php

@@ -0,0 +1,107 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Models\Tag;
+use App\Services\TagCanvas;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Validator;
+
+/**
+ * Tags canvas: shows which resources have which tag, and tags or untags a resource.
+ * Called by resources/js/environment-canvas.js through the /canvas/api session bridge.
+ */
+class TagCanvasController extends Controller
+{
+    public function __construct(private TagCanvas $canvas) {}
+
+    public function show(Request $request): JsonResponse
+    {
+        $teamId = getTeamIdFromToken();
+        if (is_null($teamId)) {
+            return invalidTokenResponse();
+        }
+        $this->authorize('viewAny', Tag::class);
+
+        $user = $request->user();
+        $token = $user->currentAccessToken();
+        $canEdit = $user->isAdminOfTeam((int) $teamId) && ($token->can('root') || $token->can('write'));
+
+        return response()->json($this->canvas->payload((int) $teamId, $canEdit));
+    }
+
+    public function storeLink(Request $request): JsonResponse
+    {
+        $teamId = getTeamIdFromToken();
+        if (is_null($teamId)) {
+            return invalidTokenResponse();
+        }
+
+        $return = validateIncomingRequest($request);
+        if ($return instanceof JsonResponse) {
+            return $return;
+        }
+        $validator = Validator::make($request->all(), [
+            'source' => ['required', 'string', 'max:255'],
+            'target' => ['required', 'string', 'max:255'],
+        ]);
+        if ($validator->fails()) {
+            return response()->json(['message' => 'Validation failed.', 'errors' => $validator->errors()], 422);
+        }
+
+        $tag = $this->findTag((int) $teamId, $request->input('source'));
+        $resource = $this->canvas->resources((int) $teamId)->get($request->input('target'));
+        $errors = [];
+        if (! $tag) {
+            $errors['source'] = ['The source must be a tag of this team.'];
+        }
+        if (! $resource) {
+            $errors['target'] = ['The target must be a resource of this team.'];
+        }
+        if ($errors !== []) {
+            return response()->json(['message' => 'Validation failed.', 'errors' => $errors], 422);
+        }
+        $this->authorize('update', $resource);
+
+        if ($resource->tags->contains('id', $tag->id)) {
+            $message = "{$resource->name} already has the {$tag->name} tag.";
+
+            return response()->json(['message' => $message, 'errors' => ['target' => [$message]]], 422);
+        }
+        $resource->tags()->attach($tag->id);
+
+        return response()->json($this->canvas->link($tag, $resource), 201);
+    }
+
+    public function destroyLink(Request $request): JsonResponse
+    {
+        $teamId = getTeamIdFromToken();
+        if (is_null($teamId)) {
+            return invalidTokenResponse();
+        }
+
+        [$source, $target] = array_pad(explode('|', (string) $request->route('link_id'), 2), 2, '');
+        $tag = $this->findTag((int) $teamId, $source);
+        $resource = $this->canvas->resources((int) $teamId)->get($target);
+        if (! $tag || ! $resource || ! $resource->tags->contains('id', $tag->id)) {
+            return response()->json(['message' => 'Link not found.'], 404);
+        }
+        $this->authorize('update', $resource);
+
+        // The tag stays, also without resources. Delete it on the Tags page.
+        $resource->tags()->detach($tag->id);
+
+        return response()->json(['message' => 'Link removed.']);
+    }
+
+    private function findTag(int $teamId, ?string $nodeId): ?Tag
+    {
+        if (! str_starts_with((string) $nodeId, 'tag:')) {
+            return null;
+        }
+
+        return Tag::query()->where('team_id', $teamId)->where('uuid', substr($nodeId, strlen('tag:')))->first();
+    }
+}

app/Http/Controllers/ProfileAvatarController.php

@@ -2,14 +2,24 @@
 
 namespace App\Http\Controllers;
 
+use App\Models\User;
 use App\Services\AvatarStorageService;
 use Illuminate\Http\Response;
 
 class ProfileAvatarController extends Controller
 {
-    public function __invoke(AvatarStorageService $avatarStorage): Response
+    public function __invoke(AvatarStorageService $avatarStorage, ?int $user_id = null): Response
     {
-        $contents = $avatarStorage->contents(auth()->user());
+        $user = auth()->user();
+
+        if ($user_id !== null && $user_id !== $user->id) {
+            $user = User::query()
+                ->whereKey($user_id)
+                ->whereHas('teams', fn ($query) => $query->whereIn('teams.id', auth()->user()->teams()->select('teams.id')))
+                ->firstOrFail();
+        }
+
+        $contents = $avatarStorage->contents($user);
         abort_if($contents === null, 404);
 
         return response($contents, 200, [

app/Http/Controllers/TeamAvatarController.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Services\TeamAvatarStorageService;
+use Illuminate\Http\Response;
+
+class TeamAvatarController extends Controller
+{
+    public function __invoke(int $team_id, TeamAvatarStorageService $avatarStorage): Response
+    {
+        $team = auth()->user()->teams()->whereKey($team_id)->firstOrFail();
+        $contents = $avatarStorage->teamContents($team);
+
+        abort_if($contents === null, 404);
+
+        return response($contents, 200, [
+            'Content-Type' => 'image/jpeg',
+            'Cache-Control' => 'private, max-age=31536000, immutable',
+        ]);
+    }
+}