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starlarkhttp.go
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starlarkhttp.go
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// The MIT License (MIT)
//
// Copyright (c) 2018 QRI, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package starlarkhttp
// This module uses qri-io/starlib's http module as a base, and adds Tidbyt
// specific headers to all requests.
import (
"bytes"
"encoding/json"
"fmt"
"io"
"mime/multipart"
"net/http"
"net/url"
"strconv"
"strings"
util "github.com/qri-io/starlib/util"
"go.starlark.net/starlark"
"go.starlark.net/starlarkstruct"
)
// AsString unquotes a starlark string value
func AsString(x starlark.Value) (string, error) {
return strconv.Unquote(x.String())
}
// ModuleName defines the expected name for this Module when used
// in starlark's load() function, eg: load('http.star', 'http')
const ModuleName = "http.star"
var (
// StarlarkHTTPClient is the http client used to create the http module. override with
// a custom client before calling LoadModule
StarlarkHTTPClient = http.DefaultClient
// StarlarkHTTPGuard is a global RequestGuard used in LoadModule. override with a custom
// implementation before calling LoadModule
StarlarkHTTPGuard RequestGuard
)
// Encodings for form data.
//
// See: https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST
const (
formEncodingMultipart = "multipart/form-data"
formEncodingURL = "application/x-www-form-urlencoded"
)
// LoadModule creates an http Module
func LoadModule() (starlark.StringDict, error) {
var m = &Module{cli: StarlarkHTTPClient}
if StarlarkHTTPGuard != nil {
m.rg = StarlarkHTTPGuard
}
ns := starlark.StringDict{
"http": m.Struct(),
}
return ns, nil
}
// RequestGuard controls access to http by checking before making requests
// if Allowed returns an error the request will be denied
type RequestGuard interface {
Allowed(thread *starlark.Thread, req *http.Request) (*http.Request, error)
}
// Module joins http tools to a dataset, allowing dataset
// to follow along with http requests
type Module struct {
cli *http.Client
rg RequestGuard
}
// Struct returns this module's methods as a starlark Struct
func (m *Module) Struct() *starlarkstruct.Struct {
return starlarkstruct.FromStringDict(starlarkstruct.Default, m.StringDict())
}
// StringDict returns all module methods in a starlark.StringDict
func (m *Module) StringDict() starlark.StringDict {
return starlark.StringDict{
"get": starlark.NewBuiltin("get", m.reqMethod("get")),
"put": starlark.NewBuiltin("put", m.reqMethod("put")),
"post": starlark.NewBuiltin("post", m.reqMethod("post")),
"delete": starlark.NewBuiltin("delete", m.reqMethod("delete")),
"patch": starlark.NewBuiltin("patch", m.reqMethod("patch")),
"options": starlark.NewBuiltin("options", m.reqMethod("options")),
}
}
// reqMethod is a factory function for generating starlark builtin functions for different http request methods
func (m *Module) reqMethod(method string) func(thread *starlark.Thread, _ *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
return func(thread *starlark.Thread, _ *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var (
urlv starlark.String
params = &starlark.Dict{}
headers = &starlark.Dict{}
formBody = &starlark.Dict{}
formEncoding starlark.String
auth starlark.Tuple
body starlark.String
jsonBody starlark.Value
ttl starlark.Int
)
if err := starlark.UnpackArgs(method, args, kwargs, "url", &urlv, "params?", ¶ms, "headers", &headers, "body", &body, "form_body", &formBody, "form_encoding", &formEncoding, "json_body", &jsonBody, "auth", &auth, "ttl_seconds?", &ttl); err != nil {
return nil, err
}
rawurl, err := AsString(urlv)
if err != nil {
return nil, err
}
if err = setQueryParams(&rawurl, params); err != nil {
return nil, err
}
req, err := http.NewRequest(strings.ToUpper(method), rawurl, nil)
if err != nil {
return nil, err
}
if m.rg != nil {
req, err = m.rg.Allowed(thread, req)
if err != nil {
return nil, err
}
}
if err = setHeaders(req, headers); err != nil {
return nil, err
}
if err = setStandardHeaders(req, thread, ttl); err != nil {
return nil, err
}
if err = setAuth(req, auth); err != nil {
return nil, err
}
if err = SetBody(req, body, formBody, formEncoding, jsonBody); err != nil {
return nil, err
}
res, err := m.cli.Do(req)
if err != nil {
return nil, err
}
r := &Response{*res}
return r.Struct(), nil
}
}
func setQueryParams(rawurl *string, params *starlark.Dict) error {
keys := params.Keys()
if len(keys) == 0 {
return nil
}
u, err := url.Parse(*rawurl)
if err != nil {
return err
}
q := u.Query()
for _, key := range keys {
keystr, err := AsString(key)
if err != nil {
return err
}
val, _, err := params.Get(key)
if err != nil {
return err
}
if val.Type() != "string" {
return fmt.Errorf("expected param value for key '%s' to be a string. got: '%s'", key, val.Type())
}
valstr, err := AsString(val)
if err != nil {
return err
}
q.Set(keystr, valstr)
}
u.RawQuery = q.Encode()
*rawurl = u.String()
return nil
}
func setAuth(req *http.Request, auth starlark.Tuple) error {
if len(auth) == 0 {
return nil
} else if len(auth) == 2 {
username, err := AsString(auth[0])
if err != nil {
return fmt.Errorf("parsing auth username string: %s", err.Error())
}
password, err := AsString(auth[1])
if err != nil {
return fmt.Errorf("parsing auth password string: %s", err.Error())
}
req.SetBasicAuth(username, password)
return nil
}
return fmt.Errorf("expected two values for auth params tuple")
}
func setStandardHeaders(req *http.Request, thread *starlark.Thread, ttl starlark.Int) error {
// Set app identifier.
req.Header.Set("X-Tidbyt-App", getAppIdentifier(thread))
// Set ttl for caching client.
ttl64, ok := ttl.Int64()
if !ok {
return fmt.Errorf("ttl_seconds must be valid integer (not %s)", ttl.String())
}
req.Header.Set("X-Tidbyt-Cache-Seconds", fmt.Sprintf("%d", ttl64))
return nil
}
func getAppIdentifier(thread *starlark.Thread) string {
parts := strings.Split(thread.Name, "/")
if len(parts) > 0 {
return parts[0]
}
return thread.Name
}
func setHeaders(req *http.Request, headers *starlark.Dict) error {
keys := headers.Keys()
if len(keys) == 0 {
return nil
}
for _, key := range keys {
keystr, err := AsString(key)
if err != nil {
return err
}
val, _, err := headers.Get(key)
if err != nil {
return err
}
if val.Type() != "string" {
return fmt.Errorf("expected param value for key '%s' to be a string. got: '%s'", key, val.Type())
}
valstr, err := AsString(val)
if err != nil {
return err
}
req.Header.Add(keystr, valstr)
}
return nil
}
func SetBody(req *http.Request, body starlark.String, formData *starlark.Dict, formEncoding starlark.String, jsondata starlark.Value) error {
if !util.IsEmptyString(body) {
uq, err := strconv.Unquote(body.String())
if err != nil {
return err
}
req.Body = io.NopCloser(strings.NewReader(uq))
// Specifying the Content-Length ensures that https://go.dev/src/net/http/transfer.go doesnt specify Transfer-Encoding: chunked which is not supported by some endpoints.
// This is required when using io.NopCloser method for the request body (see ShouldSendChunkedRequestBody() in the library mentioned above).
req.ContentLength = int64(len(uq))
return nil
}
if jsondata != nil && jsondata.String() != "" {
req.Header.Set("Content-Type", "application/json")
v, err := util.Unmarshal(jsondata)
if err != nil {
return err
}
data, err := json.Marshal(v)
if err != nil {
return err
}
req.Body = io.NopCloser(bytes.NewBuffer(data))
req.ContentLength = int64(len(data))
}
if formData != nil && formData.Len() > 0 {
form := url.Values{}
for _, key := range formData.Keys() {
keystr, err := AsString(key)
if err != nil {
return err
}
val, _, err := formData.Get(key)
if err != nil {
return err
}
if val.Type() != "string" {
return fmt.Errorf("expected param value for key '%s' to be a string. got: '%s'", key, val.Type())
}
valstr, err := AsString(val)
if err != nil {
return err
}
form.Add(keystr, valstr)
}
var contentType string
switch formEncoding {
case formEncodingURL, "":
contentType = formEncodingURL
req.Body = io.NopCloser(strings.NewReader(form.Encode()))
req.ContentLength = int64(len(form.Encode()))
case formEncodingMultipart:
var b bytes.Buffer
mw := multipart.NewWriter(&b)
defer mw.Close()
contentType = mw.FormDataContentType()
for k, values := range form {
for _, v := range values {
w, err := mw.CreateFormField(k)
if err != nil {
return err
}
if _, err := w.Write([]byte(v)); err != nil {
return err
}
}
}
req.Body = io.NopCloser(&b)
default:
return fmt.Errorf("unknown form encoding: %s", formEncoding)
}
if req.Header.Get("Content-Type") == "" {
req.Header.Set("Content-Type", contentType)
}
}
return nil
}
// Response represents an HTTP response, wrapping a go http.Response with
// starlark methods
type Response struct {
http.Response
}
// Struct turns a response into a *starlark.Struct
func (r *Response) Struct() *starlarkstruct.Struct {
return starlarkstruct.FromStringDict(starlarkstruct.Default, starlark.StringDict{
"url": starlark.String(r.Request.URL.String()),
"status_code": starlark.MakeInt(r.StatusCode),
"headers": r.HeadersDict(),
"encoding": starlark.String(strings.Join(r.TransferEncoding, ",")),
"body": starlark.NewBuiltin("body", r.Text),
"json": starlark.NewBuiltin("json", r.JSON),
})
}
// HeadersDict flops
func (r *Response) HeadersDict() *starlark.Dict {
d := new(starlark.Dict)
for key, vals := range r.Header {
if err := d.SetKey(starlark.String(key), starlark.String(strings.Join(vals, ","))); err != nil {
panic(err)
}
}
return d
}
// Text returns the raw data as a string
func (r *Response) Text(thread *starlark.Thread, _ *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
data, err := io.ReadAll(r.Body)
if err != nil {
return nil, err
}
r.Body.Close()
// reset reader to allow multiple calls
r.Body = io.NopCloser(bytes.NewReader(data))
return starlark.String(string(data)), nil
}
// JSON attempts to parse the response body as JSON
func (r *Response) JSON(thread *starlark.Thread, _ *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var data interface{}
body, err := io.ReadAll(r.Body)
if err != nil {
return nil, err
}
if err := json.Unmarshal(body, &data); err != nil {
return nil, err
}
r.Body.Close()
// reset reader to allow multiple calls
r.Body = io.NopCloser(bytes.NewReader(body))
return util.Marshal(data)
}