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client.go
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client.go
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package goodreads
import (
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strconv"
)
const (
defaultApiRoot = "https://www.goodreads.com"
reviewListPath = "/review/list.xml"
authorShowPath = "/author/show.xml"
bookShowPath = "/book/show.xml"
userShowPath = "/user/show.xml"
searchPath = "/search/index.xml"
)
type Client struct {
apiKey string
httpClient *http.Client
rootUrl string
}
func NewClient(apiKey string) *Client {
return NewClientWithHttpClient(apiKey, http.DefaultClient)
}
func NewClientWithHttpClient(apiKey string, httpClient *http.Client) *Client {
return NewClientWithHttpClientAndRootUrl(apiKey, httpClient, "")
}
func NewClientWithHttpClientAndRootUrl(apiKey string, httpClient *http.Client, rootUrl string) *Client {
return &Client{apiKey: apiKey, httpClient: httpClient, rootUrl: rootUrl}
}
func (c *Client) GetUser(id string, limit int) (*User, error) {
params := toURLValues(map[string]string{
"key": c.apiKey,
"id": id,
})
response := &Response{}
err := c.getData(userShowPath, params, response)
if err != nil {
return nil, err
}
for i := range response.User.Statuses {
status := &response.User.Statuses[i]
bookid := status.Book.ID
book, err := c.GetBook(bookid)
if err != nil {
return nil, err
}
status.Book = *book
}
if len(response.User.Statuses) >= limit {
response.User.Statuses = response.User.Statuses[:limit]
} else {
remaining := limit - len(response.User.Statuses)
lastRead, err := c.GetLastRead(id, remaining)
if err != nil {
return nil, err
}
response.User.LastRead = lastRead
}
return &response.User, nil
}
func (c *Client) GetBook(id string) (*Book, error) {
params := toURLValues(map[string]string{
"key": c.apiKey,
"id": id,
})
response := &Response{}
err := c.getData(bookShowPath, params, response)
if err != nil {
return nil, err
}
return &response.Book, nil
}
func (c *Client) GetAuthor(id string) (*Author, error) {
params := toURLValues(map[string]string{
"key": c.apiKey,
"id": id,
})
response := &AuthorResponse{}
err := c.getData(authorShowPath, params, response)
if err != nil {
return nil, err
}
return &response.Author, nil
}
func (c *Client) GetLastRead(id string, limit int) ([]Review, error) {
l := strconv.Itoa(limit)
params := toURLValues(map[string]string{
"key": c.apiKey,
"v": "2",
"id": id,
"shelf": "read",
"sort": "date_read",
"order": "d",
"per_page": l,
})
response := &Response{}
err := c.getData(reviewListPath, params, response)
if err != nil {
return []Review{}, err
}
return response.Reviews, nil
}
func (c *Client) ReviewsForShelf(user *User, shelf string) ([]Review, error) {
reviews := make([]Review, 0)
perPage := 200
pages := (user.ReviewCount / perPage) + 1
// Keep looping until we have all the reviews
for i := 1; i <= pages; i++ {
params := toURLValues(map[string]string{
"key": c.apiKey,
"id": user.ID,
"v": "2",
"page": strconv.Itoa(i),
"per_page": strconv.Itoa(perPage),
"shelf": shelf,
})
response := &Response{}
err := c.getData(reviewListPath, params, response)
if err != nil {
return []Review{}, err
}
reviews = append(reviews, response.Reviews...)
}
return reviews, nil
}
func (c *Client) Search(query string) ([]Work, error) {
params := toURLValues(map[string]string{
"key": c.apiKey,
"q": query,
})
response := &SearchResponse{}
err := c.getData(searchPath, params, response)
if err != nil {
return []Work{}, err
}
return response.Results, nil
}
func (c *Client) getData(path string, params url.Values, i interface{}) error {
rootUrl := c.rootUrl
if rootUrl == "" {
rootUrl = defaultApiRoot
}
uri, err := url.Parse(fmt.Sprintf("%s%s", rootUrl, path))
if err != nil {
return err
}
uri.RawQuery = params.Encode()
data, err := c.getRequest(uri.String())
if err != nil {
return err
}
return xmlUnmarshal(data, i)
}
func (c *Client) getRequest(uri string) ([]byte, error) {
res, err := c.httpClient.Get(uri)
if err != nil {
return []byte{}, err
}
body, err := ioutil.ReadAll(res.Body)
res.Body.Close()
if err != nil {
return []byte{}, err
}
return body, nil
}
func toURLValues(m map[string]string) url.Values {
params := url.Values{}
for key, value := range m {
params.Add(key, value)
}
return params
}