github.com/argoproj/argo-cd/v2@v2.10.9/applicationset/services/internal/http/client.go (about)

     1  package http
     2  
     3  import (
     4  	"bytes"
     5  	"context"
     6  	"encoding/json"
     7  	"fmt"
     8  	"io"
     9  	"net/http"
    10  	"strings"
    11  	"time"
    12  )
    13  
    14  const (
    15  	userAgent      = "argocd-applicationset"
    16  	defaultTimeout = 30
    17  )
    18  
    19  type Client struct {
    20  	// URL is the URL used for API requests.
    21  	baseURL string
    22  
    23  	// UserAgent is the user agent to include in HTTP requests.
    24  	UserAgent string
    25  
    26  	// Token is used to make authenticated API calls.
    27  	token string
    28  
    29  	// Client is an HTTP client used to communicate with the API.
    30  	client *http.Client
    31  }
    32  
    33  type ErrorResponse struct {
    34  	Body     []byte
    35  	Response *http.Response
    36  	Message  string
    37  }
    38  
    39  func NewClient(baseURL string, options ...ClientOptionFunc) (*Client, error) {
    40  	client, err := newClient(baseURL, options...)
    41  	if err != nil {
    42  		return nil, err
    43  	}
    44  	return client, nil
    45  }
    46  
    47  func newClient(baseURL string, options ...ClientOptionFunc) (*Client, error) {
    48  	c := &Client{baseURL: baseURL, UserAgent: userAgent}
    49  
    50  	// Configure the HTTP client.
    51  	c.client = &http.Client{
    52  		Timeout: time.Duration(defaultTimeout) * time.Second,
    53  	}
    54  
    55  	// Apply any given client options.
    56  	for _, fn := range options {
    57  		if fn == nil {
    58  			continue
    59  		}
    60  		if err := fn(c); err != nil {
    61  			return nil, err
    62  		}
    63  	}
    64  
    65  	return c, nil
    66  }
    67  
    68  func (c *Client) NewRequest(method, path string, body interface{}, options []ClientOptionFunc) (*http.Request, error) {
    69  
    70  	// Make sure the given URL end with a slash
    71  	if !strings.HasSuffix(c.baseURL, "/") {
    72  		c.baseURL += "/"
    73  	}
    74  
    75  	var buf io.ReadWriter
    76  	if body != nil {
    77  		buf = &bytes.Buffer{}
    78  		enc := json.NewEncoder(buf)
    79  		enc.SetEscapeHTML(false)
    80  		err := enc.Encode(body)
    81  		if err != nil {
    82  			return nil, err
    83  		}
    84  	}
    85  
    86  	req, err := http.NewRequest(method, c.baseURL+path, buf)
    87  	if err != nil {
    88  		return nil, err
    89  	}
    90  
    91  	if body != nil {
    92  		req.Header.Set("Content-Type", "application/json")
    93  	}
    94  
    95  	if len(c.token) != 0 {
    96  		req.Header.Set("Authorization", "Bearer "+c.token)
    97  	}
    98  
    99  	if c.UserAgent != "" {
   100  		req.Header.Set("User-Agent", c.UserAgent)
   101  	}
   102  
   103  	return req, nil
   104  }
   105  
   106  func (c *Client) Do(ctx context.Context, req *http.Request, v interface{}) (*http.Response, error) {
   107  	resp, err := c.client.Do(req)
   108  	if err != nil {
   109  		return nil, err
   110  	}
   111  
   112  	defer resp.Body.Close()
   113  
   114  	if err := CheckResponse(resp); err != nil {
   115  		return resp, err
   116  	}
   117  
   118  	switch v := v.(type) {
   119  	case nil:
   120  	case io.Writer:
   121  		_, err = io.Copy(v, resp.Body)
   122  	default:
   123  		buf := new(bytes.Buffer)
   124  		teeReader := io.TeeReader(resp.Body, buf)
   125  		decErr := json.NewDecoder(teeReader).Decode(v)
   126  		if decErr == io.EOF {
   127  			decErr = nil // ignore EOF errors caused by empty response body
   128  		}
   129  		if decErr != nil {
   130  			err = fmt.Errorf("%s: %s", decErr.Error(), buf.String())
   131  		}
   132  	}
   133  	return resp, err
   134  }
   135  
   136  // CheckResponse checks the API response for errors, and returns them if present.
   137  func CheckResponse(resp *http.Response) error {
   138  
   139  	if c := resp.StatusCode; 200 <= c && c <= 299 {
   140  		return nil
   141  	}
   142  
   143  	data, err := io.ReadAll(resp.Body)
   144  	if err != nil {
   145  		return fmt.Errorf("API error with status code %d: %v", resp.StatusCode, err)
   146  	}
   147  
   148  	var raw map[string]interface{}
   149  	if err := json.Unmarshal(data, &raw); err != nil {
   150  		return fmt.Errorf("API error with status code %d: %s", resp.StatusCode, string(data))
   151  	}
   152  
   153  	message := ""
   154  	if value, ok := raw["message"].(string); ok {
   155  		message = value
   156  	} else if value, ok := raw["error"].(string); ok {
   157  		message = value
   158  	}
   159  
   160  	return fmt.Errorf("API error with status code %d: %s", resp.StatusCode, message)
   161  }