Add vendor (steam)

5 files changed, 671 insertions, 0 deletions

diff --git a/vendor/github.com/Philipp15b/go-steam/tradeoffer/client.go b/vendor/github.com/Philipp15b/go-steam/tradeoffer/client.go
new file mode 100644
index 00000000..7bf171c3
--- /dev/null
+++ b/vendor/github.com/Philipp15b/go-steam/tradeoffer/client.go
@@ -0,0 +1,452 @@
+package tradeoffer
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/Philipp15b/go-steam/community"
+	"github.com/Philipp15b/go-steam/economy/inventory"
+	"github.com/Philipp15b/go-steam/netutil"
+	"github.com/Philipp15b/go-steam/steamid"
+	"io/ioutil"
+	"net/http"
+	"strconv"
+	"time"
+)
+
+type APIKey string
+
+const apiUrl = "https://api.steampowered.com/IEconService/%s/v%d"
+
+type Client struct {
+	client    *http.Client
+	key       APIKey
+	sessionId string
+}
+
+func NewClient(key APIKey, sessionId, steamLogin, steamLoginSecure string) *Client {
+	c := &Client{
+		new(http.Client),
+		key,
+		sessionId,
+	}
+	community.SetCookies(c.client, sessionId, steamLogin, steamLoginSecure)
+	return c
+}
+
+func (c *Client) GetOffer(offerId uint64) (*TradeOfferResult, error) {
+	resp, err := c.client.Get(fmt.Sprintf(apiUrl, "GetTradeOffer", 1) + "?" + netutil.ToUrlValues(map[string]string{
+		"key":          string(c.key),
+		"tradeofferid": strconv.FormatUint(offerId, 10),
+		"language":     "en_us",
+	}).Encode())
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	t := new(struct {
+		Response *TradeOfferResult
+	})
+	if err = json.NewDecoder(resp.Body).Decode(t); err != nil {
+		return nil, err
+	}
+	if t.Response == nil || t.Response.Offer == nil {
+		return nil, newSteamErrorf("steam returned empty offer result\n")
+	}
+
+	return t.Response, nil
+}
+
+func (c *Client) GetOffers(getSent bool, getReceived bool, getDescriptions bool, activeOnly bool, historicalOnly bool, timeHistoricalCutoff *uint32) (*TradeOffersResult, error) {
+	if !getSent && !getReceived {
+		return nil, fmt.Errorf("getSent and getReceived can't be both false\n")
+	}
+
+	params := map[string]string{
+		"key": string(c.key),
+	}
+	if getSent {
+		params["get_sent_offers"] = "1"
+	}
+	if getReceived {
+		params["get_received_offers"] = "1"
+	}
+	if getDescriptions {
+		params["get_descriptions"] = "1"
+		params["language"] = "en_us"
+	}
+	if activeOnly {
+		params["active_only"] = "1"
+	}
+	if historicalOnly {
+		params["historical_only"] = "1"
+	}
+	if timeHistoricalCutoff != nil {
+		params["time_historical_cutoff"] = strconv.FormatUint(uint64(*timeHistoricalCutoff), 10)
+	}
+	resp, err := c.client.Get(fmt.Sprintf(apiUrl, "GetTradeOffers", 1) + "?" + netutil.ToUrlValues(params).Encode())
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	t := new(struct {
+		Response *TradeOffersResult
+	})
+	if err = json.NewDecoder(resp.Body).Decode(t); err != nil {
+		return nil, err
+	}
+	if t.Response == nil {
+		return nil, newSteamErrorf("steam returned empty offers result\n")
+	}
+	return t.Response, nil
+}
+
+// action() is used by Decline() and Cancel()
+// Steam only return success and error fields for malformed requests,
+// hence client shall use GetOffer() to check action result
+// It is also possible to implement Decline/Cancel using steamcommunity,
+// which have more predictable responses
+func (c *Client) action(method string, version uint, offerId uint64) error {
+	resp, err := c.client.Do(netutil.NewPostForm(fmt.Sprintf(apiUrl, method, version), netutil.ToUrlValues(map[string]string{
+		"key":          string(c.key),
+		"tradeofferid": strconv.FormatUint(offerId, 10),
+	})))
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != 200 {
+		return fmt.Errorf(method+" error: status code %d", resp.StatusCode)
+	}
+	return nil
+}
+
+func (c *Client) Decline(offerId uint64) error {
+	return c.action("DeclineTradeOffer", 1, offerId)
+}
+
+func (c *Client) Cancel(offerId uint64) error {
+	return c.action("CancelTradeOffer", 1, offerId)
+}
+
+// Accept received trade offer
+// It is best to confirm that offer was actually accepted
+// by calling GetOffer after Accept and checking offer state
+func (c *Client) Accept(offerId uint64) error {
+	baseurl := fmt.Sprintf("https://steamcommunity.com/tradeoffer/%d/", offerId)
+	req := netutil.NewPostForm(baseurl+"accept", netutil.ToUrlValues(map[string]string{
+		"sessionid":    c.sessionId,
+		"serverid":     "1",
+		"tradeofferid": strconv.FormatUint(offerId, 10),
+	}))
+	req.Header.Add("Referer", baseurl)
+
+	resp, err := c.client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	t := new(struct {
+		StrError string `json:"strError"`
+	})
+	if err = json.NewDecoder(resp.Body).Decode(t); err != nil {
+		return err
+	}
+	if t.StrError != "" {
+		return newSteamErrorf("accept error: %v\n", t.StrError)
+	}
+	if resp.StatusCode != 200 {
+		return fmt.Errorf("accept error: status code %d", resp.StatusCode)
+	}
+	return nil
+}
+
+type TradeItem struct {
+	AppId      uint32 `json:"appid"`
+	ContextId  uint64 `json:"contextid,string"`
+	Amount     uint64 `json:"amount"`
+	AssetId    uint64 `json:"assetid,string,omitempty"`
+	CurrencyId uint64 `json:"currencyid,string,omitempty"`
+}
+
+// Sends a new trade offer to the given Steam user. You can optionally specify an access token if you've got one.
+// In addition, `counteredOfferId` can be non-nil, indicating the trade offer this is a counter for.
+// On success returns trade offer id
+func (c *Client) Create(other steamid.SteamId, accessToken *string, myItems, theirItems []TradeItem, counteredOfferId *uint64, message string) (uint64, error) {
+	// Create new trade offer status
+	to := map[string]interface{}{
+		"newversion": true,
+		"version":    3,
+		"me": map[string]interface{}{
+			"assets":   myItems,
+			"currency": make([]struct{}, 0),
+			"ready":    false,
+		},
+		"them": map[string]interface{}{
+			"assets":   theirItems,
+			"currency": make([]struct{}, 0),
+			"ready":    false,
+		},
+	}
+
+	jto, err := json.Marshal(to)
+	if err != nil {
+		panic(err)
+	}
+
+	// Create url parameters for request
+	data := map[string]string{
+		"sessionid":         c.sessionId,
+		"serverid":          "1",
+		"partner":           other.ToString(),
+		"tradeoffermessage": message,
+		"json_tradeoffer":   string(jto),
+	}
+
+	var referer string
+	if counteredOfferId != nil {
+		referer = fmt.Sprintf("https://steamcommunity.com/tradeoffer/%d/", *counteredOfferId)
+		data["tradeofferid_countered"] = strconv.FormatUint(*counteredOfferId, 10)
+	} else {
+		// Add token for non-friend offers
+		if accessToken != nil {
+			params := map[string]string{
+				"trade_offer_access_token": *accessToken,
+			}
+			paramsJson, err := json.Marshal(params)
+			if err != nil {
+				panic(err)
+			}
+
+			data["trade_offer_create_params"] = string(paramsJson)
+
+			referer = "https://steamcommunity.com/tradeoffer/new/?partner=" + strconv.FormatUint(uint64(other.GetAccountId()), 10) + "&token=" + *accessToken
+		} else {
+
+			referer = "https://steamcommunity.com/tradeoffer/new/?partner=" + strconv.FormatUint(uint64(other.GetAccountId()), 10)
+		}
+	}
+
+	// Create request
+	req := netutil.NewPostForm("https://steamcommunity.com/tradeoffer/new/send", netutil.ToUrlValues(data))
+	req.Header.Add("Referer", referer)
+
+	// Send request
+	resp, err := c.client.Do(req)
+	if err != nil {
+		return 0, err
+	}
+	defer resp.Body.Close()
+	t := new(struct {
+		StrError     string `json:"strError"`
+		TradeOfferId uint64 `json:"tradeofferid,string"`
+	})
+	if err = json.NewDecoder(resp.Body).Decode(t); err != nil {
+		return 0, err
+	}
+	// strError code descriptions:
+	// 15	invalide trade access token
+	// 16	timeout
+	// 20	wrong contextid
+	// 25	can't send more offers until some is accepted/cancelled...
+	// 26	object is not in our inventory
+	// error code names are in internal/steamlang/enums.go EResult_name
+	if t.StrError != "" {
+		return 0, newSteamErrorf("create error: %v\n", t.StrError)
+	}
+	if resp.StatusCode != 200 {
+		return 0, fmt.Errorf("create error: status code %d", resp.StatusCode)
+	}
+	if t.TradeOfferId == 0 {
+		return 0, newSteamErrorf("create error: steam returned 0 for trade offer id")
+	}
+	return t.TradeOfferId, nil
+}
+
+func (c *Client) GetOwnInventory(contextId uint64, appId uint32) (*inventory.Inventory, error) {
+	return inventory.GetOwnInventory(c.client, contextId, appId)
+}
+
+func (c *Client) GetPartnerInventory(other steamid.SteamId, contextId uint64, appId uint32, offerId *uint64) (*inventory.Inventory, error) {
+	return inventory.GetFullInventory(func() (*inventory.PartialInventory, error) {
+		return c.getPartialPartnerInventory(other, contextId, appId, offerId, nil)
+	}, func(start uint) (*inventory.PartialInventory, error) {
+		return c.getPartialPartnerInventory(other, contextId, appId, offerId, &start)
+	})
+}
+
+func (c *Client) getPartialPartnerInventory(other steamid.SteamId, contextId uint64, appId uint32, offerId *uint64, start *uint) (*inventory.PartialInventory, error) {
+	data := map[string]string{
+		"sessionid": c.sessionId,
+		"partner":   other.ToString(),
+		"contextid": strconv.FormatUint(contextId, 10),
+		"appid":     strconv.FormatUint(uint64(appId), 10),
+	}
+	if start != nil {
+		data["start"] = strconv.FormatUint(uint64(*start), 10)
+	}
+
+	baseUrl := "https://steamcommunity.com/tradeoffer/%v/"
+	if offerId != nil {
+		baseUrl = fmt.Sprintf(baseUrl, *offerId)
+	} else {
+		baseUrl = fmt.Sprintf(baseUrl, "new")
+	}
+
+	req, err := http.NewRequest("GET", baseUrl+"partnerinventory/?"+netutil.ToUrlValues(data).Encode(), nil)
+	if err != nil {
+		panic(err)
+	}
+	req.Header.Add("Referer", baseUrl+"?partner="+strconv.FormatUint(uint64(other.GetAccountId()), 10))
+
+	return inventory.DoInventoryRequest(c.client, req)
+}
+
+// Can be used to verify accepted tradeoffer and find out received asset ids
+func (c *Client) GetTradeReceipt(tradeId uint64) ([]*TradeReceiptItem, error) {
+	url := fmt.Sprintf("https://steamcommunity.com/trade/%d/receipt", tradeId)
+	resp, err := c.client.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	respBody, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	items, err := parseTradeReceipt(respBody)
+	if err != nil {
+		return nil, newSteamErrorf("failed to parse trade receipt: %v", err)
+	}
+	return items, nil
+}
+
+// Get duration of escrow in days. Call this before sending a trade offer
+func (c *Client) GetPartnerEscrowDuration(other steamid.SteamId, accessToken *string) (*EscrowDuration, error) {
+	data := map[string]string{
+		"partner": strconv.FormatUint(uint64(other.GetAccountId()), 10),
+	}
+	if accessToken != nil {
+		data["token"] = *accessToken
+	}
+	return c.getEscrowDuration("https://steamcommunity.com/tradeoffer/new/?" + netutil.ToUrlValues(data).Encode())
+}
+
+// Get duration of escrow in days. Call this after receiving a trade offer
+func (c *Client) GetOfferEscrowDuration(offerId uint64) (*EscrowDuration, error) {
+	return c.getEscrowDuration("http://steamcommunity.com/tradeoffer/" + strconv.FormatUint(offerId, 10))
+}
+
+func (c *Client) getEscrowDuration(queryUrl string) (*EscrowDuration, error) {
+	resp, err := c.client.Get(queryUrl)
+	if err != nil {
+		return nil, fmt.Errorf("failed to retrieve escrow duration: %v", err)
+	}
+	defer resp.Body.Close()
+	respBody, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	escrowDuration, err := parseEscrowDuration(respBody)
+	if err != nil {
+		return nil, newSteamErrorf("failed to parse escrow duration: %v", err)
+	}
+	return escrowDuration, nil
+}
+
+func (c *Client) GetOfferWithRetry(offerId uint64, retryCount int, retryDelay time.Duration) (*TradeOfferResult, error) {
+	var res *TradeOfferResult
+	return res, withRetry(
+		func() (err error) {
+			res, err = c.GetOffer(offerId)
+			return err
+		}, retryCount, retryDelay)
+}
+
+func (c *Client) GetOffersWithRetry(getSent bool, getReceived bool, getDescriptions bool, activeOnly bool, historicalOnly bool, timeHistoricalCutoff *uint32, retryCount int, retryDelay time.Duration) (*TradeOffersResult, error) {
+	var res *TradeOffersResult
+	return res, withRetry(
+		func() (err error) {
+			res, err = c.GetOffers(getSent, getReceived, getDescriptions, activeOnly, historicalOnly, timeHistoricalCutoff)
+			return err
+		}, retryCount, retryDelay)
+}
+
+func (c *Client) DeclineWithRetry(offerId uint64, retryCount int, retryDelay time.Duration) error {
+	return withRetry(
+		func() error {
+			return c.Decline(offerId)
+		}, retryCount, retryDelay)
+}
+
+func (c *Client) CancelWithRetry(offerId uint64, retryCount int, retryDelay time.Duration) error {
+	return withRetry(
+		func() error {
+			return c.Cancel(offerId)
+		}, retryCount, retryDelay)
+}
+
+func (c *Client) AcceptWithRetry(offerId uint64, retryCount int, retryDelay time.Duration) error {
+	return withRetry(
+		func() error {
+			return c.Accept(offerId)
+		}, retryCount, retryDelay)
+}
+
+func (c *Client) CreateWithRetry(other steamid.SteamId, accessToken *string, myItems, theirItems []TradeItem, counteredOfferId *uint64, message string, retryCount int, retryDelay time.Duration) (uint64, error) {
+	var res uint64
+	return res, withRetry(
+		func() (err error) {
+			res, err = c.Create(other, accessToken, myItems, theirItems, counteredOfferId, message)
+			return err
+		}, retryCount, retryDelay)
+}
+
+func (c *Client) GetOwnInventoryWithRetry(contextId uint64, appId uint32, retryCount int, retryDelay time.Duration) (*inventory.Inventory, error) {
+	var res *inventory.Inventory
+	return res, withRetry(
+		func() (err error) {
+			res, err = c.GetOwnInventory(contextId, appId)
+			return err
+		}, retryCount, retryDelay)
+}
+
+func (c *Client) GetPartnerInventoryWithRetry(other steamid.SteamId, contextId uint64, appId uint32, offerId *uint64, retryCount int, retryDelay time.Duration) (*inventory.Inventory, error) {
+	var res *inventory.Inventory
+	return res, withRetry(
+		func() (err error) {
+			res, err = c.GetPartnerInventory(other, contextId, appId, offerId)
+			return err
+		}, retryCount, retryDelay)
+}
+
+func (c *Client) GetTradeReceiptWithRetry(tradeId uint64, retryCount int, retryDelay time.Duration) ([]*TradeReceiptItem, error) {
+	var res []*TradeReceiptItem
+	return res, withRetry(
+		func() (err error) {
+			res, err = c.GetTradeReceipt(tradeId)
+			return err
+		}, retryCount, retryDelay)
+}
+
+func withRetry(f func() error, retryCount int, retryDelay time.Duration) error {
+	if retryCount <= 0 {
+		panic("retry count must be more than 0")
+	}
+	i := 0
+	for {
+		i++
+		if err := f(); err != nil {
+			// If we got steam error do not retry
+			if _, ok := err.(*SteamError); ok {
+				return err
+			}
+			if i == retryCount {
+				return err
+			}
+			time.Sleep(retryDelay)
+			continue
+		}
+		break
+	}
+	return nil
+}
diff --git a/vendor/github.com/Philipp15b/go-steam/tradeoffer/error.go b/vendor/github.com/Philipp15b/go-steam/tradeoffer/error.go
new file mode 100644
index 00000000..439ee69c
--- /dev/null
+++ b/vendor/github.com/Philipp15b/go-steam/tradeoffer/error.go
@@ -0,0 +1,19 @@
+package tradeoffer
+
+import (
+	"fmt"
+)
+
+// SteamError can be returned by Create, Accept, Decline and Cancel methods.
+// It means we got response from steam, but it was in unknown format
+// or request was declined.
+type SteamError struct {
+	msg string
+}
+
+func (e *SteamError) Error() string {
+	return e.msg
+}
+func newSteamErrorf(format string, a ...interface{}) *SteamError {
+	return &SteamError{fmt.Sprintf(format, a...)}
+}
diff --git a/vendor/github.com/Philipp15b/go-steam/tradeoffer/escrow.go b/vendor/github.com/Philipp15b/go-steam/tradeoffer/escrow.go
new file mode 100644
index 00000000..07806716
--- /dev/null
+++ b/vendor/github.com/Philipp15b/go-steam/tradeoffer/escrow.go
@@ -0,0 +1,47 @@
+package tradeoffer
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strconv"
+)
+
+type EscrowDuration struct {
+	DaysMyEscrow    uint32
+	DaysTheirEscrow uint32
+}
+
+func parseEscrowDuration(data []byte) (*EscrowDuration, error) {
+	// TODO: why we are using case insensitive matching?
+	myRegex := regexp.MustCompile("(?i)g_daysMyEscrow[\\s=]+(\\d+);")
+	theirRegex := regexp.MustCompile("(?i)g_daysTheirEscrow[\\s=]+(\\d+);")
+
+	myM := myRegex.FindSubmatch(data)
+	theirM := theirRegex.FindSubmatch(data)
+
+	if myM == nil || theirM == nil {
+		// check if access token is valid
+		notFriendsRegex := regexp.MustCompile(">You are not friends with this user<")
+		notFriendsM := notFriendsRegex.FindSubmatch(data)
+		if notFriendsM == nil {
+			return nil, errors.New("regexp does not match")
+		} else {
+			return nil, errors.New("you are not friends with this user")
+		}
+	}
+
+	myEscrow, err := strconv.ParseUint(string(myM[1]), 10, 32)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse my duration into uint: %v", err)
+	}
+	theirEscrow, err := strconv.ParseUint(string(theirM[1]), 10, 32)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse their duration into uint: %v", err)
+	}
+
+	return &EscrowDuration{
+		DaysMyEscrow:    uint32(myEscrow),
+		DaysTheirEscrow: uint32(theirEscrow),
+	}, nil
+}
diff --git a/vendor/github.com/Philipp15b/go-steam/tradeoffer/receipt.go b/vendor/github.com/Philipp15b/go-steam/tradeoffer/receipt.go
new file mode 100644
index 00000000..3f4b556d
--- /dev/null
+++ b/vendor/github.com/Philipp15b/go-steam/tradeoffer/receipt.go
@@ -0,0 +1,35 @@
+package tradeoffer
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/Philipp15b/go-steam/economy/inventory"
+	"regexp"
+)
+
+type TradeReceiptItem struct {
+	AssetId   uint64 `json:"id,string"`
+	AppId     uint32
+	ContextId uint64
+	Owner     uint64 `json:",string"`
+	Pos       uint32
+	inventory.Description
+}
+
+func parseTradeReceipt(data []byte) ([]*TradeReceiptItem, error) {
+	reg := regexp.MustCompile("oItem =\\s+(.+?});")
+	itemMatches := reg.FindAllSubmatch(data, -1)
+	if itemMatches == nil {
+		return nil, fmt.Errorf("items not found\n")
+	}
+	items := make([]*TradeReceiptItem, 0, len(itemMatches))
+	for _, m := range itemMatches {
+		item := new(TradeReceiptItem)
+		err := json.Unmarshal(m[1], &item)
+		if err != nil {
+			return nil, err
+		}
+		items = append(items, item)
+	}
+	return items, nil
+}
diff --git a/vendor/github.com/Philipp15b/go-steam/tradeoffer/tradeoffer.go b/vendor/github.com/Philipp15b/go-steam/tradeoffer/tradeoffer.go
new file mode 100644
index 00000000..1cf3aaa3
--- /dev/null
+++ b/vendor/github.com/Philipp15b/go-steam/tradeoffer/tradeoffer.go
@@ -0,0 +1,118 @@
+/*
+Implements methods to interact with the official Trade Offer API.
+
+See: https://developer.valvesoftware.com/wiki/Steam_Web_API/IEconService
+*/
+package tradeoffer
+
+import (
+	"encoding/json"
+	"github.com/Philipp15b/go-steam/economy/inventory"
+	"github.com/Philipp15b/go-steam/steamid"
+)
+
+type TradeOfferState uint
+
+const (
+	TradeOfferState_Invalid                  TradeOfferState = 1  // Invalid
+	TradeOfferState_Active                                   = 2  // This trade offer has been sent, neither party has acted on it yet.
+	TradeOfferState_Accepted                                 = 3  // The trade offer was accepted by the recipient and items were exchanged.
+	TradeOfferState_Countered                                = 4  // The recipient made a counter offer
+	TradeOfferState_Expired                                  = 5  // The trade offer was not accepted before the expiration date
+	TradeOfferState_Canceled                                 = 6  // The sender cancelled the offer
+	TradeOfferState_Declined                                 = 7  // The recipient declined the offer
+	TradeOfferState_InvalidItems                             = 8  // Some of the items in the offer are no longer available (indicated by the missing flag in the output)
+	TradeOfferState_CreatedNeedsConfirmation                 = 9  // The offer hasn't been sent yet and is awaiting email/mobile confirmation. The offer is only visible to the sender.
+	TradeOfferState_CanceledBySecondFactor                   = 10 // Either party canceled the offer via email/mobile. The offer is visible to both parties, even if the sender canceled it before it was sent.
+	TradeOfferState_InEscrow                                 = 11 // The trade has been placed on hold. The items involved in the trade have all been removed from both parties' inventories and will be automatically delivered in the future.
+)
+
+type TradeOfferConfirmationMethod uint
+
+const (
+	TradeOfferConfirmationMethod_Invalid   TradeOfferConfirmationMethod = 0
+	TradeOfferConfirmationMethod_Email                                  = 1
+	TradeOfferConfirmationMethod_MobileApp                              = 2
+)
+
+type Asset struct {
+	AppId      uint32 `json:",string"`
+	ContextId  uint64 `json:",string"`
+	AssetId    uint64 `json:",string"`
+	CurrencyId uint64 `json:",string"`
+	ClassId    uint64 `json:",string"`
+	InstanceId uint64 `json:",string"`
+	Amount     uint64 `json:",string"`
+	Missing    bool
+}
+
+type TradeOffer struct {
+	TradeOfferId       uint64                       `json:",string"`
+	TradeId            uint64                       `json:",string"`
+	OtherAccountId     uint32                       `json:"accountid_other"`
+	OtherSteamId       steamid.SteamId              `json:"-"`
+	Message            string                       `json:"message"`
+	ExpirationTime     uint32                       `json:"expiraton_time"`
+	State              TradeOfferState              `json:"trade_offer_state"`
+	ToGive             []*Asset                     `json:"items_to_give"`
+	ToReceive          []*Asset                     `json:"items_to_receive"`
+	IsOurOffer         bool                         `json:"is_our_offer"`
+	TimeCreated        uint32                       `json:"time_created"`
+	TimeUpdated        uint32                       `json:"time_updated"`
+	EscrowEndDate      uint32                       `json:"escrow_end_date"`
+	ConfirmationMethod TradeOfferConfirmationMethod `json:"confirmation_method"`
+}
+
+func (t *TradeOffer) UnmarshalJSON(data []byte) error {
+	type Alias TradeOffer
+	aux := struct {
+		*Alias
+	}{
+		Alias: (*Alias)(t),
+	}
+	if err := json.Unmarshal(data, &aux); err != nil {
+		return err
+	}
+	if t.OtherAccountId == 0 {
+		t.OtherSteamId = steamid.SteamId(0)
+		return nil
+	}
+	t.OtherSteamId = steamid.SteamId(uint64(t.OtherAccountId) + 76561197960265728)
+	return nil
+}
+
+type TradeOffersResult struct {
+	Sent         []*TradeOffer `json:"trade_offers_sent"`
+	Received     []*TradeOffer `json:"trade_offers_received"`
+	Descriptions []*Description
+}
+
+type TradeOfferResult struct {
+	Offer        *TradeOffer
+	Descriptions []*Description
+}
+type Description struct {
+	AppId      uint32 `json:"appid"`
+	ClassId    uint64 `json:"classid,string"`
+	InstanceId uint64 `json:"instanceid,string"`
+
+	IconUrl      string `json:"icon_url"`
+	IconUrlLarge string `json:"icon_url_large"`
+
+	Name           string
+	MarketName     string `json:"market_name"`
+	MarketHashName string `json:"market_hash_name"`
+
+	// Colors in hex, for example `B2B2B2`
+	NameColor       string `json:"name_color"`
+	BackgroundColor string `json:"background_color"`
+
+	Type string
+
+	Tradable                  bool   `json:"tradable"`
+	Commodity                 bool   `json:"commodity"`
+	MarketTradableRestriction uint32 `json:"market_tradable_restriction"`
+
+	Descriptions inventory.DescriptionLines `json:"descriptions"`
+	Actions      []*inventory.Action        `json:"actions"`
+}