feat: add wiki management tools (#95)

Fix #94

## Summary
This PR adds wiki management support to gitea-mcp adding new tools: creating, reading, updating, and deleting wiki pages.

## Changes
- Added `operation/wiki/wiki.go` with wiki tools
- Updated `operation/operation.go` to register it
- Updated `README.md`

## New Tools
- `list_wiki_pages` - List all wiki pages in a repository
- `get_wiki_page` - Get wiki page content and metadata
- `get_wiki_revisions` - Get revision history of a wiki page
- `create_wiki_page` - Create a new wiki page
- `update_wiki_page` - Update an existing wiki page
- `delete_wiki_page` - Delete a wiki page

## Implementation Details
- Uses direct HTTP calls to Gitea wiki API endpoints (v1.16.0+)
- Follows existing MCP patterns and error handling
- Includes fallback logic to prevent "unnamed" pages during updates
- Proper base64 content encoding as per Gitea API spec

## Testing
- All 6 tools tested and working correctly
- Error handling validated
- Integration with existing MCP server confirmed
- Made a test repo & simulated a drone construction using Claude Code (in french sorry) at https://git.kernelpanik.fr/Test-Organization/test_wiki_tools/wiki

Ready for review.
Closes #[94]

Co-authored-by: nox <nox@noxen.net>
Reviewed-on: https://gitea.com/gitea/gitea-mcp/pulls/95
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-by: Bo-Yi Wu (吳柏毅) <appleboy.tw@gmail.com>
Co-authored-by: Thierry PROST <3kynox@noreply.gitea.com>
Co-committed-by: Thierry PROST <3kynox@noreply.gitea.com>

operation/operation.go

@@ -14,6 +14,7 @@ import (
 	"gitea.com/gitea/gitea-mcp/operation/search"
 	"gitea.com/gitea/gitea-mcp/operation/user"
 	"gitea.com/gitea/gitea-mcp/operation/version"
+	"gitea.com/gitea/gitea-mcp/operation/wiki"
 	mcpContext "gitea.com/gitea/gitea-mcp/pkg/context"
 	"gitea.com/gitea/gitea-mcp/pkg/flag"
 	"gitea.com/gitea/gitea-mcp/pkg/log"
@@ -45,6 +46,9 @@ func RegisterTool(s *server.MCPServer) {
 	// Version Tool
 	s.AddTools(version.Tool.Tools()...)
 
+	// Wiki Tool
+	s.AddTools(wiki.Tool.Tools()...)
+
 	s.DeleteTools("")
 }
 

operation/wiki/wiki.go

@@ -0,0 +1,363 @@
+package wiki
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"gitea.com/gitea/gitea-mcp/pkg/flag"
+	"gitea.com/gitea/gitea-mcp/pkg/gitea"
+	"gitea.com/gitea/gitea-mcp/pkg/log"
+	"gitea.com/gitea/gitea-mcp/pkg/to"
+	"gitea.com/gitea/gitea-mcp/pkg/tool"
+
+	"github.com/mark3labs/mcp-go/mcp"
+	"github.com/mark3labs/mcp-go/server"
+)
+
+var Tool = tool.New()
+
+const (
+	ListWikiPagesToolName    = "list_wiki_pages"
+	GetWikiPageToolName      = "get_wiki_page"
+	GetWikiRevisionsToolName = "get_wiki_revisions"
+	CreateWikiPageToolName   = "create_wiki_page"
+	UpdateWikiPageToolName   = "update_wiki_page"
+	DeleteWikiPageToolName   = "delete_wiki_page"
+)
+
+var (
+	ListWikiPagesTool = mcp.NewTool(
+		ListWikiPagesToolName,
+		mcp.WithDescription("List all wiki pages in a repository"),
+		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
+		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
+	)
+
+	GetWikiPageTool = mcp.NewTool(
+		GetWikiPageToolName,
+		mcp.WithDescription("Get a wiki page content and metadata"),
+		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
+		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
+		mcp.WithString("pageName", mcp.Required(), mcp.Description("wiki page name")),
+	)
+
+	GetWikiRevisionsTool = mcp.NewTool(
+		GetWikiRevisionsToolName,
+		mcp.WithDescription("Get revisions history of a wiki page"),
+		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
+		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
+		mcp.WithString("pageName", mcp.Required(), mcp.Description("wiki page name")),
+	)
+
+	CreateWikiPageTool = mcp.NewTool(
+		CreateWikiPageToolName,
+		mcp.WithDescription("Create a new wiki page"),
+		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
+		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
+		mcp.WithString("title", mcp.Required(), mcp.Description("wiki page title")),
+		mcp.WithString("content_base64", mcp.Required(), mcp.Description("page content, base64 encoded")),
+		mcp.WithString("message", mcp.Description("commit message (optional)")),
+	)
+
+	UpdateWikiPageTool = mcp.NewTool(
+		UpdateWikiPageToolName,
+		mcp.WithDescription("Update an existing wiki page"),
+		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
+		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
+		mcp.WithString("pageName", mcp.Required(), mcp.Description("current wiki page name")),
+		mcp.WithString("title", mcp.Description("new page title (optional)")),
+		mcp.WithString("content_base64", mcp.Required(), mcp.Description("page content, base64 encoded")),
+		mcp.WithString("message", mcp.Description("commit message (optional)")),
+	)
+
+	DeleteWikiPageTool = mcp.NewTool(
+		DeleteWikiPageToolName,
+		mcp.WithDescription("Delete a wiki page"),
+		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
+		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
+		mcp.WithString("pageName", mcp.Required(), mcp.Description("wiki page name to delete")),
+	)
+)
+
+func init() {
+	Tool.RegisterRead(server.ServerTool{
+		Tool:    ListWikiPagesTool,
+		Handler: ListWikiPagesFn,
+	})
+	Tool.RegisterRead(server.ServerTool{
+		Tool:    GetWikiPageTool,
+		Handler: GetWikiPageFn,
+	})
+	Tool.RegisterRead(server.ServerTool{
+		Tool:    GetWikiRevisionsTool,
+		Handler: GetWikiRevisionsFn,
+	})
+	Tool.RegisterWrite(server.ServerTool{
+		Tool:    CreateWikiPageTool,
+		Handler: CreateWikiPageFn,
+	})
+	Tool.RegisterWrite(server.ServerTool{
+		Tool:    UpdateWikiPageTool,
+		Handler: UpdateWikiPageFn,
+	})
+	Tool.RegisterWrite(server.ServerTool{
+		Tool:    DeleteWikiPageTool,
+		Handler: DeleteWikiPageFn,
+	})
+}
+
+func ListWikiPagesFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
+	log.Debugf("Called ListWikiPagesFn")
+	owner, ok := req.GetArguments()["owner"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("owner is required"))
+	}
+	repo, ok := req.GetArguments()["repo"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("repo is required"))
+	}
+
+	client, err := gitea.ClientFromContext(ctx)
+	if err != nil {
+		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
+	}
+
+	// Use direct HTTP request because SDK does not support yet wikis
+	result, err := makeWikiAPIRequest(ctx, client, "GET", fmt.Sprintf("repos/%s/%s/wiki/pages", url.QueryEscape(owner), url.QueryEscape(repo)), nil)
+	if err != nil {
+		return to.ErrorResult(fmt.Errorf("list wiki pages err: %v", err))
+	}
+
+	return to.TextResult(result)
+}
+
+func GetWikiPageFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
+	log.Debugf("Called GetWikiPageFn")
+	owner, ok := req.GetArguments()["owner"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("owner is required"))
+	}
+	repo, ok := req.GetArguments()["repo"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("repo is required"))
+	}
+	pageName, ok := req.GetArguments()["pageName"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("pageName is required"))
+	}
+
+	client, err := gitea.ClientFromContext(ctx)
+	if err != nil {
+		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
+	}
+
+	result, err := makeWikiAPIRequest(ctx, client, "GET", fmt.Sprintf("repos/%s/%s/wiki/page/%s", url.QueryEscape(owner), url.QueryEscape(repo), url.QueryEscape(pageName)), nil)
+	if err != nil {
+		return to.ErrorResult(fmt.Errorf("get wiki page err: %v", err))
+	}
+
+	return to.TextResult(result)
+}
+
+func GetWikiRevisionsFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
+	log.Debugf("Called GetWikiRevisionsFn")
+	owner, ok := req.GetArguments()["owner"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("owner is required"))
+	}
+	repo, ok := req.GetArguments()["repo"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("repo is required"))
+	}
+	pageName, ok := req.GetArguments()["pageName"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("pageName is required"))
+	}
+
+	client, err := gitea.ClientFromContext(ctx)
+	if err != nil {
+		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
+	}
+
+	result, err := makeWikiAPIRequest(ctx, client, "GET", fmt.Sprintf("repos/%s/%s/wiki/revisions/%s", url.QueryEscape(owner), url.QueryEscape(repo), url.QueryEscape(pageName)), nil)
+	if err != nil {
+		return to.ErrorResult(fmt.Errorf("get wiki revisions err: %v", err))
+	}
+
+	return to.TextResult(result)
+}
+
+func CreateWikiPageFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
+	log.Debugf("Called CreateWikiPageFn")
+	owner, ok := req.GetArguments()["owner"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("owner is required"))
+	}
+	repo, ok := req.GetArguments()["repo"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("repo is required"))
+	}
+	title, ok := req.GetArguments()["title"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("title is required"))
+	}
+	contentBase64, ok := req.GetArguments()["content_base64"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("content_base64 is required"))
+	}
+
+	message, _ := req.GetArguments()["message"].(string)
+	if message == "" {
+		message = fmt.Sprintf("Create wiki page '%s'", title)
+	}
+
+	requestBody := map[string]string{
+		"title":          title,
+		"content_base64": contentBase64,
+		"message":        message,
+	}
+
+	client, err := gitea.ClientFromContext(ctx)
+	if err != nil {
+		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
+	}
+
+	result, err := makeWikiAPIRequest(ctx, client, "POST", fmt.Sprintf("repos/%s/%s/wiki/new", url.QueryEscape(owner), url.QueryEscape(repo)), requestBody)
+	if err != nil {
+		return to.ErrorResult(fmt.Errorf("create wiki page err: %v", err))
+	}
+
+	return to.TextResult(result)
+}
+
+func UpdateWikiPageFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
+	log.Debugf("Called UpdateWikiPageFn")
+	owner, ok := req.GetArguments()["owner"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("owner is required"))
+	}
+	repo, ok := req.GetArguments()["repo"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("repo is required"))
+	}
+	pageName, ok := req.GetArguments()["pageName"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("pageName is required"))
+	}
+	contentBase64, ok := req.GetArguments()["content_base64"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("content_base64 is required"))
+	}
+
+	requestBody := map[string]string{
+		"content_base64": contentBase64,
+	}
+
+	// If title is given, use it. Otherwise, keep current page name
+	if title, ok := req.GetArguments()["title"].(string); ok && title != "" {
+		requestBody["title"] = title
+	} else {
+		// Utiliser pageName comme fallback pour éviter "unnamed"
+		requestBody["title"] = pageName
+	}
+
+	if message, ok := req.GetArguments()["message"].(string); ok && message != "" {
+		requestBody["message"] = message
+	} else {
+		requestBody["message"] = fmt.Sprintf("Update wiki page '%s'", pageName)
+	}
+
+	client, err := gitea.ClientFromContext(ctx)
+	if err != nil {
+		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
+	}
+
+	result, err := makeWikiAPIRequest(ctx, client, "PATCH", fmt.Sprintf("repos/%s/%s/wiki/page/%s", url.QueryEscape(owner), url.QueryEscape(repo), url.QueryEscape(pageName)), requestBody)
+	if err != nil {
+		return to.ErrorResult(fmt.Errorf("update wiki page err: %v", err))
+	}
+
+	return to.TextResult(result)
+}
+
+func DeleteWikiPageFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
+	log.Debugf("Called DeleteWikiPageFn")
+	owner, ok := req.GetArguments()["owner"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("owner is required"))
+	}
+	repo, ok := req.GetArguments()["repo"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("repo is required"))
+	}
+	pageName, ok := req.GetArguments()["pageName"].(string)
+	if !ok {
+		return to.ErrorResult(fmt.Errorf("pageName is required"))
+	}
+
+	client, err := gitea.ClientFromContext(ctx)
+	if err != nil {
+		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
+	}
+
+	_, err = makeWikiAPIRequest(ctx, client, "DELETE", fmt.Sprintf("repos/%s/%s/wiki/page/%s", url.QueryEscape(owner), url.QueryEscape(repo), url.QueryEscape(pageName)), nil)
+	if err != nil {
+		return to.ErrorResult(fmt.Errorf("delete wiki page err: %v", err))
+	}
+
+	return to.TextResult(map[string]string{"message": "Wiki page deleted successfully"})
+}
+
+// Helper function to make HTTP requests to Gitea Wiki API
+func makeWikiAPIRequest(ctx context.Context, client interface{}, method, path string, body interface{}) (interface{}, error) {
+	// Use flags to get base URL and token
+	apiURL := fmt.Sprintf("%s/api/v1/%s", flag.Host, path)
+	
+	httpClient := &http.Client{}
+	
+	var reqBody io.Reader
+	if body != nil {
+		bodyBytes, err := json.Marshal(body)
+		if err != nil {
+			return nil, fmt.Errorf("failed to marshal request body: %w", err)
+		}
+		reqBody = strings.NewReader(string(bodyBytes))
+	}
+
+	req, err := http.NewRequestWithContext(ctx, method, apiURL, reqBody)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Authorization", fmt.Sprintf("token %s", flag.Token))
+	req.Header.Set("Accept", "application/json")
+	if body != nil {
+		req.Header.Set("Content-Type", "application/json")
+	}
+
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to make request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return nil, fmt.Errorf("API request failed with status %d", resp.StatusCode)
+	}
+
+	if method == "DELETE" {
+		return map[string]string{"message": "success"}, nil
+	}
+
+	var result interface{}
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, fmt.Errorf("failed to decode response: %w", err)
+	}
+
+	return result, nil
+}