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package openbao
import (
"context"
"encoding/json"
"fmt"
"net/http"
"strings"
"time"
"github.com/johnandersen777/socialweb-computer-kcp/internal/contract/vault"
)
var _ vault.AtprotoSessions = (*Handle)(nil)
type atprotoEnvelope struct {
Data map[string]any `json:"data"`
Errors []string `json:"errors"`
}
func (h *Handle) sessionTarget(ctx context.Context, mount, path string) (*Client, string, error) {
mount = strings.Trim(strings.TrimSpace(mount), "/")
path = strings.Trim(strings.TrimSpace(path), "/")
did, ok := strings.CutPrefix(path, "session/")
if !strings.HasPrefix(mount, "auth/") || !ok || did == "" || strings.Contains(did, "/") {
return nil, "", fmt.Errorf("openbao: an atproto session is auth/<mount> and session/<did>, not %s and %s", mount, path)
}
target := mount + "/" + path
if !h.allows(target) {
return nil, "", fmt.Errorf("%w: %s", ErrOutOfScope, target)
}
client, err := h.clients(ctx, mount)
if err != nil {
return nil, "", err
}
return client, target, nil
}
func (h *Handle) Session(ctx context.Context, mount, path string) (vault.AtprotoSession, error) {
client, target, err := h.sessionTarget(ctx, mount, path)
if err != nil {
return vault.AtprotoSession{}, err
}
status, raw, err := client.Raw(ctx, http.MethodGet, target, nil)
if err != nil {
return vault.AtprotoSession{}, err
}
data, err := atprotoAnswer(http.MethodGet, target, status, raw)
if err != nil {
return vault.AtprotoSession{}, err
}
s := vault.AtprotoSession{DID: answerString(data, "did"), Handle: answerString(data, "handle"), PDS: answerString(data, "pds"),
Scope: answerString(data, "scope"), Status: answerString(data, "status"), StatusReason: answerString(data, "status_reason")}
if at, perr := time.Parse(time.RFC3339, answerString(data, "expires_at")); perr == nil {
s.ExpiresAt = at
}
if s.DID == "" {
return vault.AtprotoSession{}, fmt.Errorf("%w: %s", vault.ErrNoAtprotoSession, target)
}
return s, nil
}
func (h *Handle) Proof(ctx context.Context, mount, path, method, target, nonce string) (vault.AtprotoProof, error) {
client, session, err := h.sessionTarget(ctx, mount, path)
if err != nil {
return vault.AtprotoProof{}, err
}
body := map[string]any{"htm": method, "htu": target}
if nonce = strings.TrimSpace(nonce); nonce != "" {
body["nonce"] = nonce
}
status, raw, err := client.Raw(ctx, http.MethodPost, session+"/proof", body)
if err != nil {
return vault.AtprotoProof{}, err
}
data, err := atprotoAnswer(http.MethodPost, session+"/proof", status, raw)
if err != nil {
return vault.AtprotoProof{}, err
}
proof := vault.AtprotoProof{AccessToken: answerString(data, "access_token"), DPoP: answerString(data, "dpop_proof")}
if proof.AccessToken == "" || proof.DPoP == "" {
return vault.AtprotoProof{}, fmt.Errorf("openbao: %s/proof answered no access token or DPoP proof", session)
}
return proof, nil
}
func atprotoAnswer(method, path string, status int, raw []byte) (map[string]any, error) {
var envelope atprotoEnvelope
_ = json.Unmarshal(raw, &envelope)
reason := strings.Join(envelope.Errors, "; ")
switch {
case status == http.StatusNotFound:
return nil, fmt.Errorf("%w: %s", vault.ErrNoAtprotoSession, path)
case status == http.StatusConflict:
return nil, fmt.Errorf("%w: %s", vault.ErrAtprotoSessionInactive, reason)
case status < 200 || status > 299:
return nil, &ResponseError{Method: method, Path: path, Status: status, Body: reason}
case envelope.Data == nil:
return nil, fmt.Errorf("%w: %s", vault.ErrNoAtprotoSession, path)
}
return envelope.Data, nil
}
func answerString(data map[string]any, key string) string {
if s, ok := data[key].(string); ok {
return strings.TrimSpace(s)
}
return ""
}
