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client.go
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client.go
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package altinn
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"net/http/cookiejar"
"net/http/httputil"
"net/url"
"path"
"strings"
"text/template"
"github.com/pkg/errors"
)
const (
libraryVersion = "0.0.1"
userAgent = "go-altinn/" + libraryVersion
mediaType = "application/hal+json"
charset = "utf-8"
)
var (
BaseURL = url.URL{
Scheme: "https",
Host: "www.altinn.no",
Path: "/api/",
}
)
// NewClient returns a new Exact Globe Client client
func NewClient(httpClient *http.Client) *Client {
if httpClient == nil {
httpClient = http.DefaultClient
}
client := &Client{}
client.cookiejar, _ = cookiejar.New(nil)
client.SetHTTPClient(httpClient)
client.SetBaseURL(BaseURL)
client.SetDebug(false)
client.SetUserAgent(userAgent)
client.SetMediaType(mediaType)
client.SetCharset(charset)
return client
}
// Client manages communication with Exact Globe Client
type Client struct {
// HTTP client used to communicate with the Client.
http *http.Client
debug bool
baseURL url.URL
// credentials
apiKey string
userName string
userPassword string
cookiejar *cookiejar.Jar
// User agent for client
userAgent string
mediaType string
charset string
disallowUnknownFields bool
// Optional function called after every successful request made to the DO Clients
beforeRequestDo BeforeRequestDoCallback
onRequestCompleted RequestCompletionCallback
}
type BeforeRequestDoCallback func(*http.Client, *http.Request, interface{})
// RequestCompletionCallback defines the type of the request callback function
type RequestCompletionCallback func(*http.Request, *http.Response)
func (c *Client) SetHTTPClient(client *http.Client) {
c.http = client
c.http.Jar = c.cookiejar
}
func (c Client) Debug() bool {
return c.debug
}
func (c *Client) SetDebug(debug bool) {
c.debug = debug
}
func (c Client) APIKey() string {
return c.apiKey
}
func (c *Client) SetAPIKey(apiKey string) {
c.apiKey = apiKey
}
func (c Client) UserName() string {
return c.userName
}
func (c *Client) SetUserName(userName string) {
c.userName = userName
}
func (c Client) UserPassword() string {
return c.userPassword
}
func (c *Client) SetUserPassword(userPassword string) {
c.userPassword = userPassword
}
func (c Client) BaseURL() url.URL {
return c.baseURL
}
func (c *Client) SetBaseURL(baseURL url.URL) {
c.baseURL = baseURL
}
func (c *Client) SetMediaType(mediaType string) {
c.mediaType = mediaType
}
func (c Client) MediaType() string {
return mediaType
}
func (c *Client) SetCharset(charset string) {
c.charset = charset
}
func (c Client) Charset() string {
return charset
}
func (c *Client) SetUserAgent(userAgent string) {
c.userAgent = userAgent
}
func (c Client) UserAgent() string {
return userAgent
}
func (c *Client) SetDisallowUnknownFields(disallowUnknownFields bool) {
c.disallowUnknownFields = disallowUnknownFields
}
func (c *Client) SetBeforeRequestDo(fun BeforeRequestDoCallback) {
c.beforeRequestDo = fun
}
func (c *Client) GetEndpointURL(p string, pathParams PathParams) url.URL {
clientURL := c.BaseURL()
parsed, err := url.Parse(p)
if err != nil {
log.Fatal(err)
}
q := clientURL.Query()
for k, vv := range parsed.Query() {
for _, v := range vv {
q.Add(k, v)
}
}
clientURL.RawQuery = q.Encode()
clientURL.Path = path.Join(clientURL.Path, parsed.Path)
tmpl, err := template.New("path").Parse(clientURL.Path)
if err != nil {
log.Fatal(err)
}
buf := new(bytes.Buffer)
params := pathParams.Params()
// params["administration_id"] = c.Administration()
err = tmpl.Execute(buf, params)
if err != nil {
log.Fatal(err)
}
clientURL.Path = buf.String()
return clientURL
}
func (c *Client) NewRequest(ctx context.Context, req Request) (*http.Request, error) {
// convert body struct to json
buf := new(bytes.Buffer)
if req.RequestBodyInterface() != nil {
err := json.NewEncoder(buf).Encode(req.RequestBodyInterface())
if err != nil {
return nil, err
}
}
// create new http request
r, err := http.NewRequest(req.Method(), req.URL().String(), buf)
if err != nil {
return nil, err
}
// values := url.Values{}
// err = utils.AddURLValuesToRequest(values, req, true)
// if err != nil {
// return nil, err
// }
// optionally pass along context
if ctx != nil {
r = r.WithContext(ctx)
}
// set other headers
r.Header.Add("Content-Type", fmt.Sprintf("%s; charset=%s", c.MediaType(), c.Charset()))
r.Header.Add("Accept", c.MediaType())
r.Header.Add("User-Agent", c.UserAgent())
r.Header.Add("ApiKey", c.APIKey())
return r, nil
}
// Do sends an Client request and returns the Client response. The Client response is json decoded and stored in the value
// pointed to by v, or returned as an error if an Client error has occurred. If v implements the io.Writer interface,
// the raw response will be written to v, without attempting to decode it.
func (c *Client) Do(req *http.Request, body interface{}) (*http.Response, error) {
if c.beforeRequestDo != nil {
c.beforeRequestDo(c.http, req, body)
}
if c.debug == true {
dump, _ := httputil.DumpRequestOut(req, true)
log.Println(string(dump))
}
httpResp, err := c.http.Do(req)
if err != nil {
return nil, err
}
if c.onRequestCompleted != nil {
c.onRequestCompleted(req, httpResp)
}
// close body io.Reader
defer func() {
if rerr := httpResp.Body.Close(); err == nil {
err = rerr
}
}()
if c.debug == true {
dump, _ := httputil.DumpResponse(httpResp, true)
log.Println(string(dump))
}
// check if the response isn't an error
err = CheckResponse(httpResp)
if err != nil {
return httpResp, err
}
// check the provided interface parameter
if httpResp == nil {
return httpResp, nil
}
if body == nil {
return httpResp, err
}
if httpResp.ContentLength == 0 {
return httpResp, nil
}
errResp := &ErrorResponse{Response: httpResp}
valResp := &ValidationResponse{Response: httpResp}
err = c.Unmarshal(httpResp.Body, body, errResp, valResp)
if err != nil {
return httpResp, err
}
if errResp.Error() != "" {
return httpResp, errResp
}
if valResp.Error() != "" {
return httpResp, valResp
}
return httpResp, nil
}
func (c *Client) Unmarshal(r io.Reader, vv ...interface{}) error {
if len(vv) == 0 {
return nil
}
b, err := io.ReadAll(r)
if err != nil {
return err
}
errs := []error{}
for _, v := range vv {
r := bytes.NewReader(b)
dec := json.NewDecoder(r)
if c.disallowUnknownFields {
dec.DisallowUnknownFields()
}
err := dec.Decode(v)
if err != nil && err != io.EOF {
errs = append(errs, err)
}
}
if len(errs) == len(vv) {
// Everything errored
msgs := make([]string, len(errs))
for i, e := range errs {
msgs[i] = fmt.Sprint(e)
}
return errors.New(strings.Join(msgs, ", "))
}
return nil
}
func (c *Client) IsAuthenticated() bool {
return len(c.http.Jar.Cookies(&c.baseURL)) > 0
}
func (c *Client) Authenticate(req *http.Request) error {
if c.IsAuthenticated() {
return nil
}
authReq := c.NewAuthenticateWithPassword()
authReq.RequestBody().UserName = c.UserName()
authReq.RequestBody().UserPassword = c.UserPassword()
authReq.QueryParams().ForceEIAuthentication = false
_, err := authReq.Do()
return err
}
// CheckResponse checks the Client response for errors, and returns them if
// present. A response is considered an error if it has a status code outside
// the 200 range. Client error responses are expected to have either no response
// body, or a json response body that maps to ErrorResponse. Any other response
// body will be silently ignored.
func CheckResponse(r *http.Response) error {
errorResponse := &ErrorResponse{Response: r}
// Don't check content-lenght: a created response, for example, has no body
// if r.Header.Get("Content-Length") == "0" {
// errorResponse.Errors.Message = r.Status
// return errorResponse
// }
if c := r.StatusCode; c >= 200 && c <= 299 {
return nil
}
// read data and copy it back
data, err := io.ReadAll(r.Body)
r.Body = io.NopCloser(bytes.NewReader(data))
if err != nil {
return errorResponse
}
if r.ContentLength == 0 {
return errors.New(r.Status)
}
// convert json to struct
if len(data) != 0 {
err = json.Unmarshal(data, &errorResponse)
if err != nil {
return errors.WithStack(err)
}
}
if errorResponse.Message != "" {
return errorResponse
}
return nil
}
type ErrorResponse struct {
// HTTP response that caused this error
Response *http.Response
Message string `json:"Message"`
ModelState struct {
MessageServiceEdition []string `json:"message.ServiceEdition"`
MessageType []string `json:"message.Type"`
MessageServiceCode []string `json:"message.ServiceCode"`
} `json:"ModelState"`
}
func (r *ErrorResponse) Error() string {
errs := []string{}
if r.Message != "" {
errs = append(errs, r.Message)
}
for _, v := range r.ModelState.MessageServiceEdition {
if v != "" {
errs = append(errs, v)
}
}
for _, v := range r.ModelState.MessageType {
if v != "" {
errs = append(errs, v)
}
}
for _, v := range r.ModelState.MessageServiceCode {
if v != "" {
errs = append(errs, v)
}
}
if len(r.Message) == 0 {
return ""
}
return strings.Join(errs, "\n")
}
// {
// "ValidationErrors": [
// {
// "FieldName": "Not specified",
// "ErrorMessage": "<SchemaValidationError>The 'Melding' element is not declared.</SchemaValidationError>"
// }
// ]
// }
type ValidationResponse struct {
// HTTP response that caused this error
Response *http.Response
ValidationErrors []struct {
FieldName string `json:"FieldName"`
ErrorMessage string `json:"ErrorMessage"`
}
}
func (r *ValidationResponse) Error() string {
if len(r.ValidationErrors) == 0 {
return ""
}
errs := []string{}
for _, v := range r.ValidationErrors {
errs = append(errs, fmt.Sprintf("%s: %s", v.FieldName, v.ErrorMessage))
}
return strings.Join(errs, "\n")
}