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server.go
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server.go
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package paapi5
import (
"context"
"net/http"
"net/url"
"github.com/goark/fetch"
)
const (
defaultScheme = "https"
defaultAccept = "application/json, text/javascript"
defaultContentType = "application/json; charset=UTF-8"
defaultHMACAlgorithm = "AWS4-HMAC-SHA256"
defaultServiceName = "ProductAdvertisingAPI"
defaultContentEncoding = "amz-1.0"
defaultAWS4Request = "aws4_request"
)
//Server type is a implementation of PA-API service.
type Server struct {
scheme string
marketplace Marketplace
language string
}
//ServerOptFunc type is self-referential function type for New functions. (functional options pattern)
type ServerOptFunc func(*Server)
//New function returns an Server instance with options.
func New(opts ...ServerOptFunc) *Server {
server := &Server{scheme: defaultScheme, marketplace: DefaultMarketplace, language: ""}
for _, opt := range opts {
opt(server)
}
return server
}
//WithMarketplace function returns ServerOptFunc function value.
//This function is used in New functions that represents Marketplace data.
func WithMarketplace(marketplace Marketplace) ServerOptFunc {
return func(s *Server) {
if s != nil {
s.marketplace = marketplace
}
}
}
//WithLanguage function returns ServerOptFunc function value.
//This function is used in New functions that represents Accept-Language parameter.
func WithLanguage(language string) ServerOptFunc {
return func(s *Server) {
if s != nil {
s.language = language
}
}
}
//URL method returns url of service server information for PA-API v5.
func (s *Server) URL(path string) *url.URL {
if s == nil {
s = New()
}
return &url.URL{Scheme: s.scheme, Host: s.HostName(), Path: path}
}
//Marketplace method returns marketplace name for PA-API v5.
func (s *Server) Marketplace() string {
if s == nil {
s = New()
}
return s.marketplace.String()
}
//HostName method returns hostname for PA-API v5.
func (s *Server) HostName() string {
if s == nil {
s = New()
}
return s.marketplace.HostName()
}
//Region method returns region name for PA-API v5
func (s *Server) Region() string {
if s == nil {
s = New()
}
return s.marketplace.Region()
}
//Accept method returns Accept parameter for PA-API v5
func (s *Server) Accept() string {
return defaultAccept
}
//AcceptLanguage method returns Accept-Language parameter for PA-API v5
func (s *Server) AcceptLanguage() string {
if s == nil {
s = New()
}
if len(s.language) > 0 {
return s.language
}
return s.marketplace.Language() //default language
}
//ContentType method returns Content-Type parameter for PA-API v5
func (s *Server) ContentType() string {
return defaultContentType
}
//HMACAlgorithm method returns HMAC-Algorithm parameter for PA-API v5
func (s *Server) HMACAlgorithm() string {
return defaultHMACAlgorithm
}
//ServiceName method returns ServiceName parameter for PA-API v5
func (s *Server) ServiceName() string {
return defaultServiceName
}
//AWS4Request method returns AWS4Request parameter for PA-API v5
func (s *Server) AWS4Request() string {
return defaultAWS4Request
}
//ContentEncoding method returns Content-Encoding parameter for PA-API v5
func (s *Server) ContentEncoding() string {
return defaultContentEncoding
}
//ClientOptFunc type is self-referential function type for Server.CreateClient method. (functional options pattern)
type ClientOptFunc func(*client)
//CreateClient method returns an Client instance with associate-tag, access-key, secret-key, and other options.
func (s *Server) CreateClient(associateTag, accessKey, secretKey string, opts ...ClientOptFunc) Client {
if s == nil {
s = New()
}
cli := &client{
server: s,
client: nil,
partnerTag: associateTag,
accessKey: accessKey,
secretKey: secretKey,
}
for _, opt := range opts {
opt(cli)
}
if cli.client == nil {
cli.client = fetch.New()
}
return cli
}
//WithContext is dummy function. Because this function is deprecated.
func WithContext(ctx context.Context) ClientOptFunc {
return func(c *client) {}
}
//WithHttpClient function returns ClientOptFunc function value.
//This function is used in Server.CreateClient method that represents http.Client.
func WithHttpClient(hc *http.Client) ClientOptFunc {
return func(c *client) {
if c != nil {
c.client = fetch.New(fetch.WithHTTPClient(hc))
}
}
}
//DefaultClient function returns an default Client instance with associate-tag, access-key, and secret-key parameters.
func DefaultClient(associateTag, accessKey, secretKey string) Client {
return New().CreateClient(associateTag, accessKey, secretKey)
}
/* Copyright 2019-2021 Spiegel and contributors
*
* 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
*
* http://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.
*/