feat: llms.txt and llms-full.txt, openapi.json, MCP server
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Florian Sylvain committed
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package mcpserver
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import (
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"bytes"
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"context"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"mime/multipart"
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"net/http"
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"net/url"
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"os"
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"path/filepath"
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"strconv"
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"github.com/modelcontextprotocol/go-sdk/mcp"
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)
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const (
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docsResourceURI = "renewcms://docs/llms-full.txt"
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jsonType = "application/json"
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)
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type Options struct {
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Version string
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AllowDestructive bool
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}
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type server struct {
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client *Client
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}
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type listArticlesInput struct {
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Page int `json:"page,omitempty" jsonschema:"page number from 1"`
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Size int `json:"size,omitempty" jsonschema:"page size: 5, 25, 50 or 100"`
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Query string `json:"q,omitempty" jsonschema:"text matched in the title"`
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Status string `json:"status,omitempty" jsonschema:"online or draft"`
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Sort string `json:"sort,omitempty" jsonschema:"field:direction, e.g. title:asc or updated_at:desc"`
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Site string `json:"site,omitempty" jsonschema:"site key"`
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SEO string `json:"seo,omitempty" jsonschema:"ready, suggestions or hidden"`
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Format string `json:"format,omitempty" jsonschema:"body format: markdown, html or json"`
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}
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type getArticleInput struct {
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ID int `json:"id" jsonschema:"article id"`
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Format string `json:"format,omitempty" jsonschema:"body format: markdown, html or json"`
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}
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type createArticleInput struct {
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Title string `json:"title" jsonschema:"3 to 200 characters, cannot be changed later"`
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Body string `json:"body" jsonschema:"HTML body"`
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}
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type updateArticleBodyInput struct {
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ID int `json:"id" jsonschema:"article id"`
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Body string `json:"body" jsonschema:"new HTML body, replaces the old one"`
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}
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type articleIDInput struct {
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ID int `json:"id" jsonschema:"article id"`
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}
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type listMediaInput struct {
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Query string `json:"q,omitempty" jsonschema:"search text"`
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Filter string `json:"filter,omitempty" jsonschema:"all, unused or duplicates"`
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Sort string `json:"sort,omitempty" jsonschema:"newest, oldest, name, largest or total_size"`
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Page int `json:"page,omitempty" jsonschema:"page number from 1"`
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Size int `json:"size,omitempty" jsonschema:"page size: 5, 25, 50 or 100"`
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}
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type uploadMediaInput struct {
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Path string `json:"path,omitempty" jsonschema:"path of a local PNG, JPEG, WEBP or SVG file"`
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Base64 string `json:"base64,omitempty" jsonschema:"base64 file content, instead of path"`
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Filename string `json:"filename,omitempty" jsonschema:"file name, required with base64"`
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}
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type emptyInput struct{}
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type sitemapInput struct {
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Key string `json:"key" jsonschema:"site key"`
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Page int `json:"page,omitempty" jsonschema:"page number from 1"`
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Size int `json:"size,omitempty" jsonschema:"25, 50, 100 or 500"`
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}
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type mediaIDInput struct {
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ID int `json:"id" jsonschema:"image id"`
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}
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func New(client *Client, opts Options) *mcp.Server {
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s := &server{client: client}
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srv := mcp.NewServer(&mcp.Implementation{Name: "renewcms", Version: opts.Version}, &mcp.ServerOptions{
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Instructions: "Tools for a RenewCMS instance. Read the renewcms://docs/llms-full.txt resource for the API rules. Articles are created as drafts; ask before publishing.",
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})
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readOnly := &mcp.ToolAnnotations{ReadOnlyHint: true}
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additive := &mcp.ToolAnnotations{DestructiveHint: boolPtr(false)}
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mcp.AddTool(srv, &mcp.Tool{Name: "list_articles", Description: "List one page of articles with total and counts.", Annotations: readOnly}, s.listArticles)
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mcp.AddTool(srv, &mcp.Tool{Name: "get_article", Description: "Get one article.", Annotations: readOnly}, s.getArticle)
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mcp.AddTool(srv, &mcp.Tool{Name: "create_article", Description: "Create a draft article.", Annotations: additive}, s.createArticle)
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mcp.AddTool(srv, &mcp.Tool{Name: "update_article_body", Description: "Replace the body of an article. The previous body is overwritten.", Annotations: &mcp.ToolAnnotations{IdempotentHint: true}}, s.updateArticleBody)
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mcp.AddTool(srv, &mcp.Tool{Name: "publish_article", Description: "Make an article visible to everyone.", Annotations: &mcp.ToolAnnotations{IdempotentHint: true, DestructiveHint: boolPtr(false)}}, s.publishArticle)
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mcp.AddTool(srv, &mcp.Tool{Name: "check_seo", Description: "Check the SEO of the saved article and list suggestions.", Annotations: readOnly}, s.checkSEO)
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mcp.AddTool(srv, &mcp.Tool{Name: "list_media", Description: "List one page of the image library.", Annotations: readOnly}, s.listMedia)
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mcp.AddTool(srv, &mcp.Tool{Name: "upload_media", Description: "Upload an image from a local path or base64 content.", Annotations: additive}, s.uploadMedia)
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mcp.AddTool(srv, &mcp.Tool{Name: "list_sites", Description: "List the sites.", Annotations: readOnly}, s.listSites)
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mcp.AddTool(srv, &mcp.Tool{Name: "get_sitemap", Description: "Read the public sitemap of a site.", Annotations: readOnly}, s.getSitemap)
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if opts.AllowDestructive {
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mcp.AddTool(srv, &mcp.Tool{Name: "delete_article", Description: "Permanently delete an article."}, s.deleteArticle)
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mcp.AddTool(srv, &mcp.Tool{Name: "delete_media", Description: "Permanently delete an image."}, s.deleteMedia)
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}
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srv.AddResource(&mcp.Resource{
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URI: docsResourceURI,
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Name: "llms-full.txt",
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Description: "The full RenewCMS documentation served by the instance.",
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MIMEType: "text/plain",
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}, s.readDocs)
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srv.AddPrompt(&mcp.Prompt{
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Name: "write_and_publish_article",
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Description: "Draft an article, check its SEO and publish it after confirmation.",
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Arguments: []*mcp.PromptArgument{{Name: "topic", Description: "what the article is about", Required: true}},
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}, writePrompt)
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return srv
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}
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func boolPtr(value bool) *bool { return &value }
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func intQuery(query url.Values, name string, value int) {
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if value > 0 {
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query.Set(name, strconv.Itoa(value))
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}
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}
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func textQuery(query url.Values, name string, value string) {
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if value != "" {
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query.Set(name, value)
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}
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}
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func result(res Response, err error) (*mcp.CallToolResult, any, error) {
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if err != nil {
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return nil, nil, err
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}
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return &mcp.CallToolResult{
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IsError: res.Failed(),
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Content: []mcp.Content{&mcp.TextContent{Text: res.Describe()}},
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}, nil, nil
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}
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func (s *server) call(ctx context.Context, method string, path string, query url.Values, body any) (*mcp.CallToolResult, any, error) {
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var raw []byte
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contentType := ""
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if body != nil {
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encoded, err := json.Marshal(body)
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if err != nil {
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return nil, nil, err
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}
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raw, contentType = encoded, jsonType
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}
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return result(s.client.Do(ctx, method, path, query, raw, contentType))
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}
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func articlePath(id int, suffix string) string {
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return "/v1/article/" + strconv.Itoa(id) + suffix
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}
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func (s *server) listArticles(ctx context.Context, _ *mcp.CallToolRequest, in listArticlesInput) (*mcp.CallToolResult, any, error) {
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query := url.Values{}
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intQuery(query, "page", in.Page)
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intQuery(query, "size", in.Size)
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textQuery(query, "q", in.Query)
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textQuery(query, "status", in.Status)
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textQuery(query, "sort", in.Sort)
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textQuery(query, "site", in.Site)
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textQuery(query, "seo", in.SEO)
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textQuery(query, "format", in.Format)
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return s.call(ctx, http.MethodGet, "/v1/article/", query, nil)
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}
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func (s *server) getArticle(ctx context.Context, _ *mcp.CallToolRequest, in getArticleInput) (*mcp.CallToolResult, any, error) {
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query := url.Values{}
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textQuery(query, "format", in.Format)
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return s.call(ctx, http.MethodGet, articlePath(in.ID, ""), query, nil)
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}
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func (s *server) createArticle(ctx context.Context, _ *mcp.CallToolRequest, in createArticleInput) (*mcp.CallToolResult, any, error) {
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return s.call(ctx, http.MethodPost, "/v1/article/", nil, map[string]string{"title": in.Title, "body": in.Body})
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}
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func (s *server) updateArticleBody(ctx context.Context, _ *mcp.CallToolRequest, in updateArticleBodyInput) (*mcp.CallToolResult, any, error) {
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return s.call(ctx, http.MethodPatch, articlePath(in.ID, ""), nil, map[string]string{"body": in.Body})
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}
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func (s *server) publishArticle(ctx context.Context, _ *mcp.CallToolRequest, in articleIDInput) (*mcp.CallToolResult, any, error) {
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return s.call(ctx, http.MethodPatch, articlePath(in.ID, "/publish"), nil, nil)
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}
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func (s *server) checkSEO(ctx context.Context, _ *mcp.CallToolRequest, in articleIDInput) (*mcp.CallToolResult, any, error) {
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return s.call(ctx, http.MethodPost, articlePath(in.ID, "/seo/check"), nil, map[string]string{})
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}
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func (s *server) deleteArticle(ctx context.Context, _ *mcp.CallToolRequest, in articleIDInput) (*mcp.CallToolResult, any, error) {
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return s.call(ctx, http.MethodDelete, articlePath(in.ID, ""), nil, nil)
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}
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func (s *server) listMedia(ctx context.Context, _ *mcp.CallToolRequest, in listMediaInput) (*mcp.CallToolResult, any, error) {
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query := url.Values{}
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textQuery(query, "q", in.Query)
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textQuery(query, "filter", in.Filter)
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textQuery(query, "sort", in.Sort)
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intQuery(query, "page", in.Page)
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intQuery(query, "size", in.Size)
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return s.call(ctx, http.MethodGet, "/v1/media/", query, nil)
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}
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func (s *server) deleteMedia(ctx context.Context, _ *mcp.CallToolRequest, in mediaIDInput) (*mcp.CallToolResult, any, error) {
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return s.call(ctx, http.MethodDelete, "/v1/media/"+strconv.Itoa(in.ID), nil, nil)
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}
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func (s *server) uploadMedia(ctx context.Context, _ *mcp.CallToolRequest, in uploadMediaInput) (*mcp.CallToolResult, any, error) {
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name, content, err := uploadContent(in)
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if err != nil {
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return nil, nil, err
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}
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var form bytes.Buffer
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writer := multipart.NewWriter(&form)
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part, err := writer.CreateFormFile("file", name)
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if err != nil {
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return nil, nil, err
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}
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if _, err := part.Write(content); err != nil {
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return nil, nil, err
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}
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if err := writer.Close(); err != nil {
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return nil, nil, err
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}
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return result(s.client.Do(ctx, http.MethodPost, "/v1/media/", nil, form.Bytes(), writer.FormDataContentType()))
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}
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func uploadContent(in uploadMediaInput) (string, []byte, error) {
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switch {
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case in.Path != "" && in.Base64 != "":
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return "", nil, fmt.Errorf("give either path or base64, not both")
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case in.Path != "":
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content, err := os.ReadFile(in.Path)
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if err != nil {
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return "", nil, err
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}
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name := in.Filename
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if name == "" {
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name = filepath.Base(in.Path)
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}
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return name, content, nil
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case in.Base64 != "":
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if in.Filename == "" {
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return "", nil, fmt.Errorf("filename is required with base64")
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}
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content, err := base64.StdEncoding.DecodeString(in.Base64)
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if err != nil {
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return "", nil, fmt.Errorf("base64 content is not valid: %w", err)
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}
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return in.Filename, content, nil
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}
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return "", nil, fmt.Errorf("give a path or base64 content")
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}
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func (s *server) listSites(ctx context.Context, _ *mcp.CallToolRequest, _ emptyInput) (*mcp.CallToolResult, any, error) {
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return s.call(ctx, http.MethodGet, "/v1/site/", nil, nil)
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}
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func (s *server) getSitemap(ctx context.Context, _ *mcp.CallToolRequest, in sitemapInput) (*mcp.CallToolResult, any, error) {
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query := url.Values{}
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intQuery(query, "page", in.Page)
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intQuery(query, "size", in.Size)
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return s.call(ctx, http.MethodGet, "/v1/site/"+url.PathEscape(in.Key)+"/sitemap", query, nil)
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}
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func (s *server) readDocs(ctx context.Context, req *mcp.ReadResourceRequest) (*mcp.ReadResourceResult, error) {
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res, err := s.client.Do(ctx, http.MethodGet, "/llms-full.txt", nil, nil, "")
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if err != nil {
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return nil, err
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}
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if res.Failed() {
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return nil, fmt.Errorf("the instance did not serve its documentation: %s", res.Describe())
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}
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return &mcp.ReadResourceResult{Contents: []*mcp.ResourceContents{{
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URI: req.Params.URI,
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MIMEType: "text/plain",
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Text: res.Body,
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}}}, nil
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}
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func writePrompt(_ context.Context, req *mcp.GetPromptRequest) (*mcp.GetPromptResult, error) {
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text := "Write an article about " + req.Params.Arguments["topic"] + " for this RenewCMS instance. " +
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"Create it as a draft with create_article, run check_seo and fix what is worth fixing with update_article_body, " +
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"then show me the result and ask before calling publish_article."
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return &mcp.GetPromptResult{
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Description: "Draft, check and publish an article",
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Messages: []*mcp.PromptMessage{{Role: "user", Content: &mcp.TextContent{Text: text}}},
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}, nil
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}
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