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api.go
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api.go
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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Original source: github.com/micro/go-micro/v3/api/api.go
package api
import (
"crypto/tls"
"encoding/json"
"errors"
"io"
"io/ioutil"
"net/http"
"regexp"
"strings"
jsonpatch "github.com/evanphx/json-patch/v5"
"github.com/micro/micro/v3/service/api/resolver"
"github.com/micro/micro/v3/service/context/metadata"
"github.com/micro/micro/v3/service/registry"
"github.com/micro/micro/v3/service/server"
"github.com/micro/micro/v3/util/acme"
"github.com/micro/micro/v3/util/codec"
"github.com/micro/micro/v3/util/codec/bytes"
"github.com/micro/micro/v3/util/codec/jsonrpc"
"github.com/micro/micro/v3/util/codec/protorpc"
"github.com/micro/micro/v3/util/qson"
"github.com/oxtoacart/bpool"
)
var (
bufferPool = bpool.NewSizedBufferPool(1024, 8)
)
type buffer struct {
io.ReadCloser
}
func (b *buffer) Write(_ []byte) (int, error) {
return 0, nil
}
type API interface {
// Initialise options
Init(...Option) error
// Get the options
Options() Options
// Register a http handler
Register(*Endpoint) error
// Register a route
Deregister(*Endpoint) error
// Implementation of api
String() string
}
// Server serves api requests
type Server interface {
Address() string
Init(opts ...Option) error
Handle(path string, handler http.Handler)
Start() error
Stop() error
}
type Options struct {
EnableACME bool
EnableCORS bool
ACMEProvider acme.Provider
EnableTLS bool
ACMEHosts []string
TLSConfig *tls.Config
Resolver resolver.Resolver
Wrappers []Wrapper
}
type Option func(*Options)
type Wrapper func(h http.Handler) http.Handler
func WrapHandler(w ...Wrapper) Option {
return func(o *Options) {
o.Wrappers = append(o.Wrappers, w...)
}
}
func EnableCORS(b bool) Option {
return func(o *Options) {
o.EnableCORS = b
}
}
func EnableACME(b bool) Option {
return func(o *Options) {
o.EnableACME = b
}
}
func ACMEHosts(hosts ...string) Option {
return func(o *Options) {
o.ACMEHosts = hosts
}
}
func ACMEProvider(p acme.Provider) Option {
return func(o *Options) {
o.ACMEProvider = p
}
}
func EnableTLS(b bool) Option {
return func(o *Options) {
o.EnableTLS = b
}
}
func TLSConfig(t *tls.Config) Option {
return func(o *Options) {
o.TLSConfig = t
}
}
func Resolver(r resolver.Resolver) Option {
return func(o *Options) {
o.Resolver = r
}
}
// Endpoint is a mapping between an RPC method and HTTP endpoint
type Endpoint struct {
// RPC Method e.g. Greeter.Hello
Name string
// Description e.g what's this endpoint for
Description string
// API Handler e.g rpc, proxy
Handler string
// HTTP Host e.g example.com
Host []string
// HTTP Methods e.g GET, POST
Method []string
// HTTP Path e.g /greeter. Expect POSIX regex
Path []string
// Body destination
// "*" or "" - top level message value
// "string" - inner message value
Body string
// Stream flag
Stream bool
}
// Service represents an API service
type Service struct {
// Name of service
Name string
// The endpoint for this service
Endpoint *Endpoint
// Versions of this service
Services []*registry.Service
}
// Encode encodes an endpoint to endpoint metadata
func Encode(e *Endpoint) map[string]string {
if e == nil {
return nil
}
// endpoint map
ep := make(map[string]string)
// set vals only if they exist
set := func(k, v string) {
if len(v) == 0 {
return
}
ep[k] = v
}
set("endpoint", e.Name)
set("description", e.Description)
set("handler", e.Handler)
set("method", strings.Join(e.Method, ","))
set("path", strings.Join(e.Path, ","))
set("host", strings.Join(e.Host, ","))
return ep
}
// Decode decodes endpoint metadata into an endpoint
func Decode(e map[string]string) *Endpoint {
if e == nil {
return nil
}
return &Endpoint{
Name: e["endpoint"],
Description: e["description"],
Method: slice(e["method"]),
Path: slice(e["path"]),
Host: slice(e["host"]),
Handler: e["handler"],
}
}
// Validate validates an endpoint to guarantee it won't blow up when being served
func Validate(e *Endpoint) error {
if e == nil {
return errors.New("endpoint is nil")
}
if len(e.Name) == 0 {
return errors.New("name required")
}
for _, p := range e.Path {
ps := p[0]
pe := p[len(p)-1]
if ps == '^' && pe == '$' {
_, err := regexp.CompilePOSIX(p)
if err != nil {
return err
}
} else if ps == '^' && pe != '$' {
return errors.New("invalid path")
} else if ps != '^' && pe == '$' {
return errors.New("invalid path")
}
}
if len(e.Handler) == 0 {
return errors.New("invalid handler")
}
return nil
}
func WithEndpoint(e *Endpoint) server.HandlerOption {
return server.EndpointMetadata(e.Name, Encode(e))
}
func slice(s string) []string {
var sl []string
for _, p := range strings.Split(s, ",") {
if str := strings.TrimSpace(p); len(str) > 0 {
sl = append(sl, strings.TrimSpace(p))
}
}
return sl
}
// RequestPayload takes a *http.Request and returns the payload
// If the request is a GET the query string parameters are extracted and marshaled to JSON and the raw bytes are returned.
// If the request method is a POST the request body is read and returned
func RequestPayload(r *http.Request) ([]byte, error) {
var err error
// we have to decode json-rpc and proto-rpc because we suck
// well actually because there's no proxy codec right now
ct := r.Header.Get("Content-Type")
switch {
case strings.Contains(ct, "application/json-rpc"):
msg := codec.Message{
Type: codec.Request,
Header: make(map[string]string),
}
c := jsonrpc.NewCodec(&buffer{r.Body})
if err = c.ReadHeader(&msg, codec.Request); err != nil {
return nil, err
}
var raw json.RawMessage
if err = c.ReadBody(&raw); err != nil {
return nil, err
}
return ([]byte)(raw), nil
case strings.Contains(ct, "application/proto-rpc"), strings.Contains(ct, "application/octet-stream"):
msg := codec.Message{
Type: codec.Request,
Header: make(map[string]string),
}
c := protorpc.NewCodec(&buffer{r.Body})
if err = c.ReadHeader(&msg, codec.Request); err != nil {
return nil, err
}
var raw *bytes.Frame
if err = c.ReadBody(&raw); err != nil {
return nil, err
}
return raw.Data, nil
case strings.Contains(ct, "application/x-www-form-urlencoded"):
r.ParseForm()
// generate a new set of values from the form
vals := make(map[string]string)
for k, v := range r.Form {
vals[k] = strings.Join(v, ",")
}
// marshal
return json.Marshal(vals)
case strings.Contains(ct, "multipart/form-data"):
// 10MB buffer
if err := r.ParseMultipartForm(int64(10 << 20)); err != nil {
return nil, err
}
vals := make(map[string]interface{})
for k, v := range r.MultipartForm.Value {
vals[k] = strings.Join(v, ",")
}
for k, _ := range r.MultipartForm.File {
f, _, err := r.FormFile(k)
if err != nil {
return nil, err
}
b, err := ioutil.ReadAll(f)
if err != nil {
return nil, err
}
vals[k] = b
}
return json.Marshal(vals)
// TODO: application/grpc
}
// otherwise as per usual
ctx := r.Context()
// dont user metadata.FromContext as it mangles names
md, ok := metadata.FromContext(ctx)
if !ok {
md = make(map[string]string)
}
// allocate maximum
matches := make(map[string]interface{}, len(md))
bodydst := ""
// get fields from url path
for k, v := range md {
k = strings.ToLower(k)
// filter own keys
if strings.HasPrefix(k, "x-api-field-") {
matches[strings.TrimPrefix(k, "x-api-field-")] = v
delete(md, k)
} else if k == "x-api-body" {
bodydst = v
delete(md, k)
}
}
// map of all fields
req := make(map[string]interface{}, len(md))
// get fields from url values
if len(r.URL.RawQuery) > 0 {
umd := make(map[string]interface{})
err = qson.Unmarshal(&umd, r.URL.RawQuery)
if err != nil {
return nil, err
}
for k, v := range umd {
matches[k] = v
}
}
// restore context without fields
*r = *r.Clone(metadata.NewContext(ctx, md))
for k, v := range matches {
ps := strings.Split(k, ".")
if len(ps) == 1 {
req[k] = v
continue
}
em := make(map[string]interface{})
em[ps[len(ps)-1]] = v
for i := len(ps) - 2; i > 0; i-- {
nm := make(map[string]interface{})
nm[ps[i]] = em
em = nm
}
if vm, ok := req[ps[0]]; ok {
// nested map
nm := vm.(map[string]interface{})
for vk, vv := range em {
nm[vk] = vv
}
req[ps[0]] = nm
} else {
req[ps[0]] = em
}
}
pathbuf := []byte("{}")
if len(req) > 0 {
pathbuf, err = json.Marshal(req)
if err != nil {
return nil, err
}
}
urlbuf := []byte("{}")
out, err := jsonpatch.MergeMergePatches(urlbuf, pathbuf)
if err != nil {
return nil, err
}
switch r.Method {
case "GET":
// empty response
if strings.Contains(ct, "application/json") && string(out) == "{}" {
return out, nil
} else if string(out) == "{}" && !strings.Contains(ct, "application/json") {
return []byte{}, nil
}
return out, nil
case "PATCH", "POST", "PUT", "DELETE":
bodybuf := []byte("{}")
buf := bufferPool.Get()
defer bufferPool.Put(buf)
if _, err := buf.ReadFrom(r.Body); err != nil {
return nil, err
}
if b := buf.Bytes(); len(b) > 0 {
bodybuf = b
}
if bodydst == "" || bodydst == "*" {
// jsonpatch resequences the json object so we avoid it if possible (some usecases such as
// validating signatures require the request body to be unchangedd). We're keeping support
// for the custom paramaters for backwards compatability reasons.
if string(out) == "{}" {
return bodybuf, nil
}
if out, err = jsonpatch.MergeMergePatches(out, bodybuf); err == nil {
return out, nil
}
}
var jsonbody map[string]interface{}
if json.Valid(bodybuf) {
if err = json.Unmarshal(bodybuf, &jsonbody); err != nil {
return nil, err
}
}
dstmap := make(map[string]interface{})
ps := strings.Split(bodydst, ".")
if len(ps) == 1 {
if jsonbody != nil {
dstmap[ps[0]] = jsonbody
} else {
// old unexpected behaviour
dstmap[ps[0]] = bodybuf
}
} else {
em := make(map[string]interface{})
if jsonbody != nil {
em[ps[len(ps)-1]] = jsonbody
} else {
// old unexpected behaviour
em[ps[len(ps)-1]] = bodybuf
}
for i := len(ps) - 2; i > 0; i-- {
nm := make(map[string]interface{})
nm[ps[i]] = em
em = nm
}
dstmap[ps[0]] = em
}
bodyout, err := json.Marshal(dstmap)
if err != nil {
return nil, err
}
if out, err = jsonpatch.MergeMergePatches(out, bodyout); err == nil {
return out, nil
}
//fallback to previous unknown behaviour
return bodybuf, nil
}
return []byte{}, nil
}