JWPlatform REST API Client example

jwplatformclient.go

package ovp

import (
	"context"
	"crypto/md5"
	"fmt"
	"net/http"
	"net/url"
	"strconv"
	"time"

	jwt "github.com/dgrijalva/jwt-go"
	"github.com/pkg/errors"
)

type JWPlatformContextKey struct{}

type JWPlatformClient struct {
	Key    string
	Secret string
}

// SignURL is used to sign video or playlist URLs to that players can be allowed to play them.
func (c *JWPlatformClient) SignURL(url *url.URL, expiresAt time.Time) error {
	path := url.Path
	if path[0] == '/' {
		path = path[1:]
	}
	exp := strconv.FormatInt(expiresAt.Unix(), 10)
	sig := md5.Sum([]byte(fmt.Sprintf("%s:%s:%s", path, exp, c.Secret)))

	qs := url.Query()
	qs.Set("exp", exp)
	qs.Set("sig", fmt.Sprintf("%x", sig))
	url.RawQuery = qs.Encode()

	return nil
}

// SignRequest is used to sign v2 API endpoint calls.
func (c *JWPlatformClient) SignRequest(request *http.Request, expiresAt time.Time) error {
	var resourceID string
	var ok bool
	if resourceID, ok = request.Context().Value(JWPlatformContextKey{}).(string); !ok {
		return errors.New("cannot sign request with missing resourceID on context")
	}

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
		"resource": resourceID,
		"exp":      expiresAt.Unix(),
	})

	tokenString, err := token.SignedString(c.Secret)
	if err != nil {
		return errors.Wrapf(err, "failed to sign request for %s", resourceID)
	}

	qs := request.URL.Query()
	qs.Set("token", tokenString)
	request.URL.RawQuery = qs.Encode()

	return nil
}

// GetMediaContent is fills in the *http.Request with the required path and accept header to get a single video response. It will also add a context.Context value to be used for signing the request if needed.
func (c *JWPlatformClient) GetMediaContent(request *http.Request, mediaID string, imagewidth int) {
	contentAPIURL(request.URL)
	request.URL.Path = fmt.Sprintf("/v2/media/%s?poster_width=%d", mediaID, imagewidth)
	request.Header.Set("Accept", "application/json")

	ctx := context.WithValue(request.Context(), JWPlatformContextKey{}, mediaID)
	request = request.WithContext(ctx)
}

// GetImageContent is fills in the *http.Request with the required path and accept header to get a single video image. It will also add a context.Context value to be used for signing the request if needed.
func (c *JWPlatformClient) GetImageContent(request *http.Request, mediaID string, imagewidth int) {
	contentAPIURL(request.URL)
	request.URL.Path = fmt.Sprintf("/thumbs/%s-%d", mediaID, imagewidth)
	request.Header.Set("Accept", "image/jpeg")

	ctx := context.WithValue(request.Context(), JWPlatformContextKey{}, mediaID)
	request = request.WithContext(ctx)
}

// GetPlaylistContent is fills in the *http.Request with the required path and accept header to get a playlist of videos. It will also add a context.Context value to be used for signing the request if needed.
func (c *JWPlatformClient) GetPlaylistContent(request *http.Request, playlistID string, imagewidth int, pagelimit int, pageoffset int) {
	contentAPIURL(request.URL)
	request.URL.Path = fmt.Sprintf("/v2/media/%s?poster_width=%d&page_limit=%d&page_offset=%d", playlistID, imagewidth, pagelimit, pageoffset)
	request.Header.Set("Accept", "application/json")

	ctx := context.WithValue(request.Context(), JWPlatformContextKey{}, playlistID)
	request = request.WithContext(ctx)
}

func contentAPIURL(url *url.URL) {
	url.Scheme = "https"
	url.Host = "cdn.jwplayer.com"
}

responses.go

package ovp

type MediaResponse struct {
	FeedInstanceID string `json:"feed_instance_id"`
	Title          string `json:"title"`
	Kind           string `json:"kind"`
	Playlist       []struct {
		Mediaid     string `json:"mediaid"`
		Description string `json:"description"`
		Pubdate     int    `json:"pubdate"`
		Tags        string `json:"tags"`
		Image       string `json:"image"`
		Title       string `json:"title"`
		Variations  struct {
		} `json:"variations"`
		Sources []struct {
			Type   string `json:"type"`
			File   string `json:"file"`
			Width  int    `json:"width,omitempty"`
			Height int    `json:"height,omitempty"`
			Label  string `json:"label,omitempty"`
		} `json:"sources"`
		Tracks []struct {
			Kind  string `json:"kind"`
			File  string `json:"file"`
			Label string `json:"label,omitempty"`
		} `json:"tracks"`
		Link     string `json:"link"`
		Duration int    `json:"duration"`
	} `json:"playlist"`
	Description string `json:"description"`
}

type PlaylistResponse struct {
	Playist []MediaResponse `json:"playlist"`
}