4274b48ea5
Shared LRU avoids repeated Gitea calls for default-branch resolution; the simple stdlib map alternative would race on concurrent access without a mutex per entry, which is more code than the LRU.
89 lines
2.0 KiB
Go
89 lines
2.0 KiB
Go
package tools
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import (
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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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"gitea.d-ma.be/mathias/gitea-mcp/internal/allowlist"
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"gitea.d-ma.be/mathias/gitea-mcp/internal/gitea"
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"gitea.d-ma.be/mathias/gitea-mcp/internal/registry"
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)
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const fileReadMaxBytes = 1 << 20 // 1 MiB
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type FileRead struct {
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c *gitea.Client
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a *allowlist.Allowlist
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}
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func NewFileRead(c *gitea.Client, a *allowlist.Allowlist) *FileRead {
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return &FileRead{c: c, a: a}
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}
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func (t *FileRead) Descriptor() registry.ToolDescriptor {
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return registry.ToolDescriptor{
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Name: "file_read",
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Description: "Read a file from a repo at a given ref. Defaults to the repo's default branch.",
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InputSchema: json.RawMessage(`{
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"type":"object",
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"properties":{
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"owner":{"type":"string"},
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"name":{"type":"string"},
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"path":{"type":"string"},
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"ref":{"type":"string"}
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},
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"required":["owner","name","path"]
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}`),
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}
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}
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type fileReadArgs struct {
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Owner string `json:"owner"`
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Name string `json:"name"`
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Path string `json:"path"`
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Ref string `json:"ref"`
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}
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func (t *FileRead) Call(ctx context.Context, raw json.RawMessage) (json.RawMessage, error) {
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var args fileReadArgs
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if err := parseArgs(raw, &args); err != nil {
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return nil, err
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}
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if err := t.a.Check(args.Owner); err != nil {
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return nil, err
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}
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ref := args.Ref
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if ref == "" {
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var err error
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ref, err = t.c.DefaultBranch(ctx, args.Owner, args.Name)
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if err != nil {
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return nil, err
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}
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}
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fc, err := t.c.GetFileContents(ctx, args.Owner, args.Name, args.Path, ref)
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if err != nil {
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return nil, err
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}
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if fc.Size > fileReadMaxBytes {
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return nil, fmt.Errorf("file %q size %d exceeds 1MiB cap: %w", args.Path, fc.Size, gitea.ErrValidation)
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}
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decoded, err := base64.StdEncoding.DecodeString(fc.Content)
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if err != nil {
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return nil, fmt.Errorf("decode base64 content: %w", err)
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}
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return textOK(map[string]any{
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"path": fc.Path,
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"ref": ref,
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"sha": fc.Sha,
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"size": fc.Size,
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"content": string(decoded),
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})
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}
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