/
client.go
124 lines (101 loc) · 2.42 KB
/
client.go
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package etherscan
import (
"context"
"encoding/json"
"errors"
"io"
"net/http"
"strconv"
"strings"
"github.com/trenddapp/backend/pkg/paginator"
"github.com/trenddapp/backend/service/nft/pkg/model"
)
const (
URL = "https://api-rinkeby.etherscan.io/api"
)
var (
ErrUnknown = errors.New("unknown error")
)
type client struct {
apiKey string
httpClient *http.Client
}
func NewClient(config *Config) Client {
return &client{
apiKey: config.APIKey,
httpClient: http.DefaultClient,
}
}
func (c *client) ListAccountNFTs(
ctx context.Context,
address string,
pageSize int,
pageToken string,
) ([]model.NFT, string, error) {
request, err := http.NewRequestWithContext(ctx, http.MethodGet, URL+"", http.NoBody)
if err != nil {
return nil, "", err
}
page := 1
if pageToken != "" {
id, _, err := paginator.ParsePageToken(pageToken)
if err != nil {
return nil, "", err
}
page, err = strconv.Atoi(id)
if err != nil {
return nil, "", err
}
}
query := request.URL.Query()
query.Add("action", "tokennfttx")
query.Add("address", address)
query.Add("apikey", c.apiKey)
query.Add("module", "account")
query.Add("offset", strconv.Itoa(pageSize))
query.Add("page", strconv.Itoa(page))
request.URL.RawQuery = query.Encode()
response, err := c.httpClient.Do(request)
if err != nil {
return nil, "", err
}
defer response.Body.Close()
if response.StatusCode != http.StatusOK {
return nil, "", ErrUnknown
}
body, err := io.ReadAll(response.Body)
if err != nil {
return nil, "", err
}
var result struct {
Transactions []struct {
ContractAddress string `json:"contractAddress"`
To string `json:"to"`
TokenID string `json:"tokenID"`
} `json:"result"`
}
if err := json.Unmarshal(body, &result); err != nil {
var result struct {
Message string `json:"message"`
}
if err := json.Unmarshal(body, &result); err != nil {
return nil, "", err
}
return nil, "", errors.New(result.Message)
}
nfts := make([]model.NFT, 0, len(result.Transactions))
for _, transaction := range result.Transactions {
if !strings.EqualFold(address, transaction.To) {
continue
}
nfts = append(nfts, model.NFT{
ContractAddress: transaction.ContractAddress,
TokenID: transaction.TokenID,
})
}
nextPageToken := ""
if len(nfts) == pageSize {
nextPageToken = paginator.GeneratePageToken(strconv.Itoa(page+1), "UNSPECIFIED")
}
return nfts, nextPageToken, nil
}