brokeyourbike/paystack-api-client-go

package paystack

import (
    "bytes"
    "context"
    "encoding/json"
    "fmt"
    "io"
    "net/http"
    "strings"

    "github.com/sirupsen/logrus"
)

const defaultBaseURL = "https://api.paystack.co"

type HttpClient interface {
    Do(req *http.Request) (*http.Response, error)
}

type Client interface {
    ResolveBankAccount(ctx context.Context, bankCode, accountNumber string) (data ResolveResponse, err error)
}

var _ Client = (*client)(nil)

type client struct {
    httpClient HttpClient
    logger     *logrus.Logger
    baseURL    string
    token      string
}

// ClientOption is a function that configures a Client.
type ClientOption func(*client)

// WithHTTPClient sets the HTTP client for the paystack API client.
func WithHTTPClient(c HttpClient) ClientOption {
    return func(target *client) {
        target.httpClient = c
    }
}

// WithLogger sets the *logrus.Logger for the paystack API client.
func WithLogger(l *logrus.Logger) ClientOption {
    return func(target *client) {
        target.logger = l
    }
}

// WithBaseURL sets the base URL for the paystack API client.
func WithBaseURL(baseURL string) ClientOption {
    return func(target *client) {
        target.baseURL = strings.TrimSuffix(baseURL, "/")
    }
}

func NewClient(token string, options ...ClientOption) *client {
    c := &client{
        httpClient: http.DefaultClient,
        baseURL:    defaultBaseURL,
        token:      token,
    }

    for _, option := range options {
        option(c)
    }

    return c
}

func (c *client) newRequest(ctx context.Context, method, url string) (*request, error) {
    req, err := http.NewRequestWithContext(ctx, method, c.baseURL+url, nil)
    if err != nil {
        return nil, fmt.Errorf("failed to create request: %w", err)
    }

    req.Header.Set("Content-Type", "application/json")
    req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", c.token))
    return NewRequest(req), nil
}

func (c *client) do(ctx context.Context, req *request) error {
    if c.logger != nil {
        c.logger.WithContext(ctx).WithFields(logrus.Fields{
            "http.request.method": req.req.Method,
            "http.request.url":    req.req.URL.String(),
        }).Debug("paystack.client -> request")
    }

    resp, err := c.httpClient.Do(req.req)
    if err != nil {
        return fmt.Errorf("failed to send request: %w", err)
    }
    defer resp.Body.Close()

    b, err := io.ReadAll(resp.Body)
    if err != nil {
        return fmt.Errorf("failed to read response body: %w", err)
    }

    resp.Body = io.NopCloser(bytes.NewBuffer(b))

    if c.logger != nil {
        c.logger.WithContext(ctx).WithFields(logrus.Fields{
            "http.response.status_code":  resp.StatusCode,
            "http.response.body.content": string(b),
            "http.response.headers":      resp.Header,
        }).Debug("paystack.client -> response")
    }

    if req.decodeTo != nil {
        if err := json.NewDecoder(resp.Body).Decode(req.decodeTo); err != nil {
            return fmt.Errorf("failed to decode response: %w", err)
        }
    }

    return nil
}