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453 lines
14 KiB
Go
453 lines
14 KiB
Go
package tradeoffer
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import (
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"encoding/json"
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"fmt"
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"github.com/Philipp15b/go-steam/community"
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"github.com/Philipp15b/go-steam/economy/inventory"
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"github.com/Philipp15b/go-steam/netutil"
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"github.com/Philipp15b/go-steam/steamid"
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"io/ioutil"
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"net/http"
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"strconv"
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"time"
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)
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type APIKey string
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const apiUrl = "https://api.steampowered.com/IEconService/%s/v%d"
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type Client struct {
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client *http.Client
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key APIKey
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sessionId string
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}
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func NewClient(key APIKey, sessionId, steamLogin, steamLoginSecure string) *Client {
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c := &Client{
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new(http.Client),
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key,
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sessionId,
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}
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community.SetCookies(c.client, sessionId, steamLogin, steamLoginSecure)
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return c
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}
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func (c *Client) GetOffer(offerId uint64) (*TradeOfferResult, error) {
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resp, err := c.client.Get(fmt.Sprintf(apiUrl, "GetTradeOffer", 1) + "?" + netutil.ToUrlValues(map[string]string{
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"key": string(c.key),
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"tradeofferid": strconv.FormatUint(offerId, 10),
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"language": "en_us",
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}).Encode())
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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t := new(struct {
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Response *TradeOfferResult
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})
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if err = json.NewDecoder(resp.Body).Decode(t); err != nil {
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return nil, err
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}
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if t.Response == nil || t.Response.Offer == nil {
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return nil, newSteamErrorf("steam returned empty offer result\n")
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}
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return t.Response, nil
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}
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func (c *Client) GetOffers(getSent bool, getReceived bool, getDescriptions bool, activeOnly bool, historicalOnly bool, timeHistoricalCutoff *uint32) (*TradeOffersResult, error) {
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if !getSent && !getReceived {
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return nil, fmt.Errorf("getSent and getReceived can't be both false\n")
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}
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params := map[string]string{
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"key": string(c.key),
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}
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if getSent {
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params["get_sent_offers"] = "1"
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}
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if getReceived {
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params["get_received_offers"] = "1"
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}
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if getDescriptions {
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params["get_descriptions"] = "1"
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params["language"] = "en_us"
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}
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if activeOnly {
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params["active_only"] = "1"
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}
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if historicalOnly {
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params["historical_only"] = "1"
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}
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if timeHistoricalCutoff != nil {
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params["time_historical_cutoff"] = strconv.FormatUint(uint64(*timeHistoricalCutoff), 10)
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}
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resp, err := c.client.Get(fmt.Sprintf(apiUrl, "GetTradeOffers", 1) + "?" + netutil.ToUrlValues(params).Encode())
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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t := new(struct {
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Response *TradeOffersResult
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})
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if err = json.NewDecoder(resp.Body).Decode(t); err != nil {
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return nil, err
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}
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if t.Response == nil {
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return nil, newSteamErrorf("steam returned empty offers result\n")
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}
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return t.Response, nil
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}
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// action() is used by Decline() and Cancel()
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// Steam only return success and error fields for malformed requests,
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// hence client shall use GetOffer() to check action result
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// It is also possible to implement Decline/Cancel using steamcommunity,
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// which have more predictable responses
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func (c *Client) action(method string, version uint, offerId uint64) error {
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resp, err := c.client.Do(netutil.NewPostForm(fmt.Sprintf(apiUrl, method, version), netutil.ToUrlValues(map[string]string{
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"key": string(c.key),
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"tradeofferid": strconv.FormatUint(offerId, 10),
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})))
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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return fmt.Errorf(method+" error: status code %d", resp.StatusCode)
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}
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return nil
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}
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func (c *Client) Decline(offerId uint64) error {
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return c.action("DeclineTradeOffer", 1, offerId)
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}
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func (c *Client) Cancel(offerId uint64) error {
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return c.action("CancelTradeOffer", 1, offerId)
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}
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// Accept received trade offer
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// It is best to confirm that offer was actually accepted
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// by calling GetOffer after Accept and checking offer state
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func (c *Client) Accept(offerId uint64) error {
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baseurl := fmt.Sprintf("https://steamcommunity.com/tradeoffer/%d/", offerId)
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req := netutil.NewPostForm(baseurl+"accept", netutil.ToUrlValues(map[string]string{
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"sessionid": c.sessionId,
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"serverid": "1",
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"tradeofferid": strconv.FormatUint(offerId, 10),
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}))
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req.Header.Add("Referer", baseurl)
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resp, err := c.client.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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t := new(struct {
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StrError string `json:"strError"`
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})
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if err = json.NewDecoder(resp.Body).Decode(t); err != nil {
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return err
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}
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if t.StrError != "" {
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return newSteamErrorf("accept error: %v\n", t.StrError)
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}
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if resp.StatusCode != 200 {
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return fmt.Errorf("accept error: status code %d", resp.StatusCode)
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}
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return nil
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}
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type TradeItem struct {
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AppId uint32 `json:"appid"`
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ContextId uint64 `json:"contextid,string"`
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Amount uint64 `json:"amount"`
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AssetId uint64 `json:"assetid,string,omitempty"`
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CurrencyId uint64 `json:"currencyid,string,omitempty"`
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}
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// Sends a new trade offer to the given Steam user. You can optionally specify an access token if you've got one.
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// In addition, `counteredOfferId` can be non-nil, indicating the trade offer this is a counter for.
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// On success returns trade offer id
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func (c *Client) Create(other steamid.SteamId, accessToken *string, myItems, theirItems []TradeItem, counteredOfferId *uint64, message string) (uint64, error) {
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// Create new trade offer status
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to := map[string]interface{}{
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"newversion": true,
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"version": 3,
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"me": map[string]interface{}{
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"assets": myItems,
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"currency": make([]struct{}, 0),
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"ready": false,
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},
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"them": map[string]interface{}{
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"assets": theirItems,
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"currency": make([]struct{}, 0),
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"ready": false,
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},
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}
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jto, err := json.Marshal(to)
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if err != nil {
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panic(err)
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}
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// Create url parameters for request
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data := map[string]string{
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"sessionid": c.sessionId,
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"serverid": "1",
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"partner": other.ToString(),
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"tradeoffermessage": message,
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"json_tradeoffer": string(jto),
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}
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var referer string
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if counteredOfferId != nil {
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referer = fmt.Sprintf("https://steamcommunity.com/tradeoffer/%d/", *counteredOfferId)
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data["tradeofferid_countered"] = strconv.FormatUint(*counteredOfferId, 10)
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} else {
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// Add token for non-friend offers
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if accessToken != nil {
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params := map[string]string{
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"trade_offer_access_token": *accessToken,
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}
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paramsJson, err := json.Marshal(params)
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if err != nil {
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panic(err)
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}
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data["trade_offer_create_params"] = string(paramsJson)
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referer = "https://steamcommunity.com/tradeoffer/new/?partner=" + strconv.FormatUint(uint64(other.GetAccountId()), 10) + "&token=" + *accessToken
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} else {
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referer = "https://steamcommunity.com/tradeoffer/new/?partner=" + strconv.FormatUint(uint64(other.GetAccountId()), 10)
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}
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}
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// Create request
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req := netutil.NewPostForm("https://steamcommunity.com/tradeoffer/new/send", netutil.ToUrlValues(data))
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req.Header.Add("Referer", referer)
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// Send request
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resp, err := c.client.Do(req)
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if err != nil {
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return 0, err
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}
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defer resp.Body.Close()
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t := new(struct {
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StrError string `json:"strError"`
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TradeOfferId uint64 `json:"tradeofferid,string"`
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})
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if err = json.NewDecoder(resp.Body).Decode(t); err != nil {
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return 0, err
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}
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// strError code descriptions:
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// 15 invalide trade access token
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// 16 timeout
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// 20 wrong contextid
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// 25 can't send more offers until some is accepted/cancelled...
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// 26 object is not in our inventory
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// error code names are in internal/steamlang/enums.go EResult_name
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if t.StrError != "" {
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return 0, newSteamErrorf("create error: %v\n", t.StrError)
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}
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if resp.StatusCode != 200 {
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return 0, fmt.Errorf("create error: status code %d", resp.StatusCode)
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}
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if t.TradeOfferId == 0 {
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return 0, newSteamErrorf("create error: steam returned 0 for trade offer id")
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}
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return t.TradeOfferId, nil
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}
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func (c *Client) GetOwnInventory(contextId uint64, appId uint32) (*inventory.Inventory, error) {
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return inventory.GetOwnInventory(c.client, contextId, appId)
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}
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func (c *Client) GetPartnerInventory(other steamid.SteamId, contextId uint64, appId uint32, offerId *uint64) (*inventory.Inventory, error) {
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return inventory.GetFullInventory(func() (*inventory.PartialInventory, error) {
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return c.getPartialPartnerInventory(other, contextId, appId, offerId, nil)
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}, func(start uint) (*inventory.PartialInventory, error) {
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return c.getPartialPartnerInventory(other, contextId, appId, offerId, &start)
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})
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}
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func (c *Client) getPartialPartnerInventory(other steamid.SteamId, contextId uint64, appId uint32, offerId *uint64, start *uint) (*inventory.PartialInventory, error) {
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data := map[string]string{
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"sessionid": c.sessionId,
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"partner": other.ToString(),
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"contextid": strconv.FormatUint(contextId, 10),
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"appid": strconv.FormatUint(uint64(appId), 10),
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}
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if start != nil {
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data["start"] = strconv.FormatUint(uint64(*start), 10)
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}
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baseUrl := "https://steamcommunity.com/tradeoffer/%v/"
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if offerId != nil {
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baseUrl = fmt.Sprintf(baseUrl, *offerId)
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} else {
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baseUrl = fmt.Sprintf(baseUrl, "new")
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}
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req, err := http.NewRequest("GET", baseUrl+"partnerinventory/?"+netutil.ToUrlValues(data).Encode(), nil)
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if err != nil {
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panic(err)
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}
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req.Header.Add("Referer", baseUrl+"?partner="+strconv.FormatUint(uint64(other.GetAccountId()), 10))
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return inventory.DoInventoryRequest(c.client, req)
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}
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// Can be used to verify accepted tradeoffer and find out received asset ids
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func (c *Client) GetTradeReceipt(tradeId uint64) ([]*TradeReceiptItem, error) {
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url := fmt.Sprintf("https://steamcommunity.com/trade/%d/receipt", tradeId)
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resp, err := c.client.Get(url)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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respBody, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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items, err := parseTradeReceipt(respBody)
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if err != nil {
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return nil, newSteamErrorf("failed to parse trade receipt: %v", err)
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}
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return items, nil
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}
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// Get duration of escrow in days. Call this before sending a trade offer
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func (c *Client) GetPartnerEscrowDuration(other steamid.SteamId, accessToken *string) (*EscrowDuration, error) {
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data := map[string]string{
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"partner": strconv.FormatUint(uint64(other.GetAccountId()), 10),
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}
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if accessToken != nil {
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data["token"] = *accessToken
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}
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return c.getEscrowDuration("https://steamcommunity.com/tradeoffer/new/?" + netutil.ToUrlValues(data).Encode())
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}
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// Get duration of escrow in days. Call this after receiving a trade offer
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func (c *Client) GetOfferEscrowDuration(offerId uint64) (*EscrowDuration, error) {
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return c.getEscrowDuration("http://steamcommunity.com/tradeoffer/" + strconv.FormatUint(offerId, 10))
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}
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func (c *Client) getEscrowDuration(queryUrl string) (*EscrowDuration, error) {
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resp, err := c.client.Get(queryUrl)
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if err != nil {
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return nil, fmt.Errorf("failed to retrieve escrow duration: %v", err)
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}
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defer resp.Body.Close()
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respBody, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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escrowDuration, err := parseEscrowDuration(respBody)
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if err != nil {
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return nil, newSteamErrorf("failed to parse escrow duration: %v", err)
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}
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return escrowDuration, nil
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}
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func (c *Client) GetOfferWithRetry(offerId uint64, retryCount int, retryDelay time.Duration) (*TradeOfferResult, error) {
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var res *TradeOfferResult
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return res, withRetry(
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func() (err error) {
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res, err = c.GetOffer(offerId)
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return err
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}, retryCount, retryDelay)
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}
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func (c *Client) GetOffersWithRetry(getSent bool, getReceived bool, getDescriptions bool, activeOnly bool, historicalOnly bool, timeHistoricalCutoff *uint32, retryCount int, retryDelay time.Duration) (*TradeOffersResult, error) {
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var res *TradeOffersResult
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return res, withRetry(
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func() (err error) {
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res, err = c.GetOffers(getSent, getReceived, getDescriptions, activeOnly, historicalOnly, timeHistoricalCutoff)
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return err
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}, retryCount, retryDelay)
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}
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func (c *Client) DeclineWithRetry(offerId uint64, retryCount int, retryDelay time.Duration) error {
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return withRetry(
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func() error {
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return c.Decline(offerId)
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}, retryCount, retryDelay)
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}
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func (c *Client) CancelWithRetry(offerId uint64, retryCount int, retryDelay time.Duration) error {
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return withRetry(
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func() error {
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return c.Cancel(offerId)
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}, retryCount, retryDelay)
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}
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func (c *Client) AcceptWithRetry(offerId uint64, retryCount int, retryDelay time.Duration) error {
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return withRetry(
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func() error {
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return c.Accept(offerId)
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}, retryCount, retryDelay)
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}
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func (c *Client) CreateWithRetry(other steamid.SteamId, accessToken *string, myItems, theirItems []TradeItem, counteredOfferId *uint64, message string, retryCount int, retryDelay time.Duration) (uint64, error) {
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var res uint64
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return res, withRetry(
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func() (err error) {
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res, err = c.Create(other, accessToken, myItems, theirItems, counteredOfferId, message)
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return err
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}, retryCount, retryDelay)
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}
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func (c *Client) GetOwnInventoryWithRetry(contextId uint64, appId uint32, retryCount int, retryDelay time.Duration) (*inventory.Inventory, error) {
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var res *inventory.Inventory
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return res, withRetry(
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func() (err error) {
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res, err = c.GetOwnInventory(contextId, appId)
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return err
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}, retryCount, retryDelay)
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}
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func (c *Client) GetPartnerInventoryWithRetry(other steamid.SteamId, contextId uint64, appId uint32, offerId *uint64, retryCount int, retryDelay time.Duration) (*inventory.Inventory, error) {
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var res *inventory.Inventory
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return res, withRetry(
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func() (err error) {
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res, err = c.GetPartnerInventory(other, contextId, appId, offerId)
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return err
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}, retryCount, retryDelay)
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}
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func (c *Client) GetTradeReceiptWithRetry(tradeId uint64, retryCount int, retryDelay time.Duration) ([]*TradeReceiptItem, error) {
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var res []*TradeReceiptItem
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return res, withRetry(
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func() (err error) {
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res, err = c.GetTradeReceipt(tradeId)
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return err
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}, retryCount, retryDelay)
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}
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func withRetry(f func() error, retryCount int, retryDelay time.Duration) error {
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if retryCount <= 0 {
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panic("retry count must be more than 0")
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}
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i := 0
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for {
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i++
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if err := f(); err != nil {
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// If we got steam error do not retry
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if _, ok := err.(*SteamError); ok {
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return err
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}
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if i == retryCount {
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return err
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}
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time.Sleep(retryDelay)
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continue
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}
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break
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}
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return nil
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}
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