status-im/status-go

package paraswap

import (
    "context"
    "encoding/json"
    "errors"
    "fmt"
)

const tokensURL = "https://apiv5.paraswap.io/tokens/%d" // nolint: gosec

type Token struct {
    Symbol   string `json:"symbol"`
    Address  string `json:"address"`
    Decimals uint   `json:"decimals"`
    Img      string `json:"img"`
    Network  int    `json:"network"`
}

type TokensResponse struct {
    Tokens []Token `json:"tokens"`
    Error  string  `json:"error"`
}

func (c *ClientV5) FetchTokensList(ctx context.Context) ([]Token, error) {
    url := fmt.Sprintf(tokensURL, c.chainID)
    response, err := c.httpClient.DoGetRequest(ctx, url, nil)
    if err != nil {
        return nil, err
    }

    return handleTokensListResponse(response)
}

func handleTokensListResponse(response []byte) ([]Token, error) {
    var tokensResponse TokensResponse
    err := json.Unmarshal(response, &tokensResponse)
    if err != nil {
        return nil, err
    }

    if tokensResponse.Error != "" {
        return nil, errors.New(tokensResponse.Error)
    }

    return tokensResponse.Tokens, nil
}