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fnapi.go
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fnapi.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package fnapi
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"strconv"
"github.com/spf13/pflag"
spb "google.golang.org/genproto/googleapis/rpc/status"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/versions"
)
var (
EndpointAddress = "https://api.namespacelabs.net"
AdminMode = false
)
func SetupFlags(flags *pflag.FlagSet) {
flags.StringVar(&EndpointAddress, "fnapi_endpoint", EndpointAddress, "The fnapi endpoint address.")
_ = flags.MarkHidden("fnapi_endpoint")
flags.BoolVar(&AdminMode, "fnapi_admin", AdminMode, "Whether to enable admin mode.")
_ = flags.MarkHidden("fnapi_admin")
}
// A nil handle indicates that the caller wants to discard the response.
func AnonymousCall(ctx context.Context, endpoint string, method string, req interface{}, handle func(io.Reader) error) error {
return Call[any]{
Endpoint: endpoint,
Method: method,
Anonymous: true, // Callers of this API do not assume that credentials are injected.
}.Do(ctx, req, handle)
}
type Call[RequestT any] struct {
Endpoint string
Method string
PreAuthenticateRequest func(*UserAuth, *RequestT) error
Anonymous bool
OptionalAuth bool // Don't fail if not authenticated.
}
func DecodeJSONResponse(resp any) func(io.Reader) error {
return func(body io.Reader) error {
return json.NewDecoder(body).Decode(resp)
}
}
func AddNamespaceHeaders(ctx context.Context, headers *http.Header) {
if tel := TelemetryOn(ctx); tel != nil && tel.IsTelemetryEnabled() {
headers.Add("NS-Client-ID", tel.GetClientID())
}
headers.Add("NS-Internal-Version", fmt.Sprintf("%d", versions.APIVersion))
if AdminMode {
headers.Add("NS-API-Mode", "admin")
}
}
func (c Call[RequestT]) Do(ctx context.Context, request RequestT, handle func(io.Reader) error) error {
headers := http.Header{}
if !c.Anonymous {
user, err := LoadUser()
if err != nil {
if !c.OptionalAuth {
return err
}
} else {
tok, err := user.GenerateToken(ctx)
if err != nil {
return err
}
headers.Add("Authorization", "Bearer "+tok)
if c.PreAuthenticateRequest != nil {
if err := c.PreAuthenticateRequest(user, &request); err != nil {
return err
}
}
}
}
AddNamespaceHeaders(ctx, &headers)
reqBytes, err := json.Marshal(request)
if err != nil {
return fnerrors.InternalError("failed to marshal request: %w", err)
}
httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, c.Endpoint+"/"+c.Method, bytes.NewReader(reqBytes))
if err != nil {
return fnerrors.InternalError("failed to construct request: %w", err)
}
for k, v := range headers {
httpReq.Header[k] = append(httpReq.Header[k], v...)
}
client := &http.Client{
Transport: http.DefaultTransport,
}
response, err := client.Do(httpReq)
if err != nil {
return fnerrors.InvocationError("namespace api", "http call failed: %w", err)
}
defer response.Body.Close()
if response.StatusCode == http.StatusOK {
if handle == nil {
return nil
}
return handle(response.Body)
}
st := &spb.Status{}
dec := json.NewDecoder(response.Body)
if err := dec.Decode(st); err == nil {
if st.Code == int32(codes.Unauthenticated) {
return ErrRelogin
}
return status.ErrorProto(st)
}
grpcMessage := response.Header[http.CanonicalHeaderKey("grpc-message")]
grpcStatus := response.Header[http.CanonicalHeaderKey("grpc-status")]
if len(grpcMessage) > 0 && len(grpcStatus) > 0 {
intVar, err := strconv.Atoi(grpcStatus[0])
if err == nil {
st.Code = int32(intVar)
st.Message = grpcMessage[0]
switch st.Code {
case int32(codes.PermissionDenied):
return fnerrors.NoAccessToLimitedFeature()
}
return status.ErrorProto(st)
}
}
switch response.StatusCode {
case http.StatusInternalServerError:
return fnerrors.InvocationError("namespace api", "internal server error, and wasn't able to parse error response")
case http.StatusForbidden:
return fnerrors.NoAccessToLimitedFeature()
case http.StatusUnauthorized:
return ErrRelogin
default:
return fnerrors.InvocationError("namespace api", "unexpected %d error reaching %q: %s", response.StatusCode, c.Endpoint, response.Status)
}
}