Added partial support for user impersonation.

client.go

@@ -8,8 +8,9 @@ import (
 )
 
 type Client struct {
-	endpoint string
-	apikey   string
+	endpoint   string
+	apikey     string
+	switchUser string
 	*http.Client
 	Limit  int
 	Offset int
@@ -24,12 +25,12 @@ var DefaultLimit int = -1  // "-1" means "No setting"
 var DefaultOffset int = -1 //"-1" means "No setting"
 
 func NewClient(endpoint, apikey string) *Client {
-	return &Client{endpoint, apikey, http.DefaultClient, DefaultLimit, DefaultOffset}
+	return &Client{endpoint, apikey, "", http.DefaultClient, DefaultLimit, DefaultOffset}
 }
 
 func NewFullTraversingClient(endpoint, apikey string) *FullTraversingClient {
 	//return &FullTraversingClient{NewClient(endpoint, apikey)}
-	return &FullTraversingClient{&Client{endpoint, apikey, http.DefaultClient, 100, 0}}
+	return &FullTraversingClient{&Client{endpoint, apikey, "", http.DefaultClient, 100, 0}}
 }
 
 // URLWithFilter return string url by concat endpoint, path and filter
@@ -62,6 +63,18 @@ func (c *Client) getPaginationClause() string {
 	return clause
 }
 
+func (c *Client) SwitchUser(userLogin string) {
+	c.switchUser = userLogin
+}
+
+func (c *Client) Do(req *http.Request) (*http.Response, error) {
+	req.Header.Add("X-Redmine-API-Key", c.apikey)
+	if c.switchUser != "" {
+		req.Header.Add("X-Redmine-Switch-User", c.switchUser)
+	}
+	return c.Client.Do(req)
+}
+
 type errorsResult struct {
 	Errors []string `json:"errors"`
 }

issue_customfields.go

@@ -25,7 +25,6 @@ func (c *Client) CustomFields() ([]CustomField, error) {
 	}
 
 	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("X-Redmine-API-Key", c.apikey)
 
 	res, err := c.Do(req)
 	if err != nil {

project.go

@@ -88,7 +88,6 @@ func (c *Client) getProjects(filter *ProjectsFilter) (*projectsResult, error) {
 	if err != nil {
 		return nil, err
 	}
-	req.Header.Add("X-Redmine-API-Key", c.apikey)
 	res, err := c.Do(req)
 	if err != nil {
 		return nil, err

time_entries.go

@@ -44,7 +44,6 @@ func (c *Client) TimeEntriesWithFilter(filter Filter) ([]TimeEntry, error) {
 	if err != nil {
 		return nil, err
 	}
-	req.Header.Add("X-Redmine-API-Key", c.apikey)
 	res, err := c.Do(req)
 	if err != nil {
 		return nil, err

user.go

@@ -105,7 +105,6 @@ func (c *Client) UsersWithFilter(filter *UsersFilter) ([]User, error) {
 	if err != nil {
 		return nil, err
 	}
-	req.Header.Add("X-Redmine-API-Key", c.apikey)
 	res, err := c.Do(req)
 	if err != nil {
 		return nil, err
@@ -163,7 +162,6 @@ func (c *Client) UserByIdAndFilter(id int, filter *UserByIdFilter) (*User, error
 	if err != nil {
 		return nil, err
 	}
-	req.Header.Add("X-Redmine-API-Key", c.apikey)
 	res, err := c.Do(req)
 	if err != nil {
 		return nil, err