added GetUser function

client.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"strconv"
 	"time"
+	"encoding/json"
 
 	"golang.org/x/time/rate"
 )
@@ -85,3 +86,67 @@ func truncate(b []byte) string {
 	}
 	return string(b)
 }
+
+// apiUser mirrors the ST user payload. Custom properties are heterogeneous,
+// so they stay raw until read individually.
+type apiUser struct {
+	ID         int64                      `json:"id"`
+	Email      string                     `json:"email"`
+	ChapterID  int64                      `json:"chapter_id"`
+	CustomProps map[string]json.RawMessage `json:"custom_user_properties"`
+}
+
+func (a apiUser) toUser() *User {
+	return &User{
+		ID:         a.ID,
+		Email:      a.Email,
+		ChapterID:  a.ChapterID,
+		Department: departmentOf(a.CustomProps),
+	}
+}
+
+// departmentOf reads the free-text "department-1" property.
+func departmentOf(props map[string]json.RawMessage) string {
+	raw, ok := props["department-1"]
+	if !ok {
+		return ""
+	}
+	var s string
+	if err := json.Unmarshal(raw, &s); err != nil {
+		return ""
+	}
+	return s
+}
+
+// isRep tolerates all three shapes "department-rep" has been seen in:
+// array of options, bare string, bare bool.
+func isRep(props map[string]json.RawMessage) bool {
+	raw, ok := props["department-rep"]
+	if !ok || len(raw) == 0 {
+		return false
+	}
+	var arr []struct{ Value string }
+	if err := json.Unmarshal(raw, &arr); err == nil {
+		return len(arr) > 0
+	}
+	var s string
+	if err := json.Unmarshal(raw, &s); err == nil {
+		return s != "" && s != "false"
+	}
+	var b bool
+	if err := json.Unmarshal(raw, &b); err == nil {
+		return b
+	}
+	return false
+}
+func (c *Client) GetUser(ctx context.Context, id int64) (*User, error) {
+	raw, err := c.do(ctx, http.MethodGet, "/users/"+strconv.FormatInt(id, 10), nil)
+	if err != nil {
+		return nil, err
+	}
+	var u apiUser
+	if err := json.Unmarshal(raw, &u); err != nil {
+		return nil, err
+	}
+	return u.toUser(), nil
+}