api_client.go

/*
 * Telstra Programmable Network API
 *
 * Telstra Programmable Network is a self-provisioning platform that allows its users to create on-demand connectivity services between multiple end-points and add various network functions to those services. Programmable Network enables to connectivity to a global ecosystem of networking services as well as public and private cloud services. Once you are connected to the platform on one or more POPs (points of presence), you can start creating those services based on the use case that you want to accomplish. The Programmable Network API is available to all customers who have registered to use the Programmable Network. To register, please contact your account representative.
 *
 * API version: 2.1.3
 * Generated by: Swagger Codegen (https://github.com/swagger-api/swagger-codegen.git)
 */

package TelstraTPN

import (
	"bytes"
	"encoding/json"
	"encoding/xml"
	"fmt"
	"errors"
	"io"
	"mime/multipart"
    "golang.org/x/oauth2"
    "golang.org/x/net/context"
	"net/http"
	"net/url"
	"time"
	"os"
	"path/filepath"
	"reflect"
	"regexp"
	"strings"
	"unicode/utf8"
	"strconv"
)

var (
	jsonCheck = regexp.MustCompile("(?i:[application|text]/json)")
	xmlCheck = regexp.MustCompile("(?i:[application|text]/xml)")
)

// APIClient manages communication with the Telstra Programmable Network API API v2.1.3
// In most cases there should be only one, shared, APIClient.
type APIClient struct {
	cfg 	*Configuration
	common 	service 		// Reuse a single struct instead of allocating one for each service on the heap.

	 // API Services
	AuthenticationApi	*AuthenticationApiService
	ContractsApi	*ContractsApiService
	CustomersApi	*CustomersApiService
	DatacentresApi	*DatacentresApiService
	EndpointsApi	*EndpointsApiService
	LinksApi	*LinksApiService
	TopologiesApi	*TopologiesApiService
	VnfsApi	*VnfsApiService
	VportsApi	*VportsApiService
}

type service struct {
	client *APIClient
}

// NewAPIClient creates a new API client. Requires a userAgent string describing your application.
// optionally a custom http.Client to allow for advanced features such as caching.
func NewAPIClient(cfg *Configuration) *APIClient {
	if cfg.HTTPClient == nil {
		cfg.HTTPClient = http.DefaultClient
	}

	c := &APIClient{}
	c.cfg = cfg
	c.common.client = c

	// API Services
	c.AuthenticationApi = (*AuthenticationApiService)(&c.common)
	c.ContractsApi = (*ContractsApiService)(&c.common)
	c.CustomersApi = (*CustomersApiService)(&c.common)
	c.DatacentresApi = (*DatacentresApiService)(&c.common)
	c.EndpointsApi = (*EndpointsApiService)(&c.common)
	c.LinksApi = (*LinksApiService)(&c.common)
	c.TopologiesApi = (*TopologiesApiService)(&c.common)
	c.VnfsApi = (*VnfsApiService)(&c.common)
	c.VportsApi = (*VportsApiService)(&c.common)

	return c
}

func atoi(in string) (int, error) {
	return strconv.Atoi(in)
}


// selectHeaderContentType select a content type from the available list.
func selectHeaderContentType(contentTypes []string) string {
	if len(contentTypes) == 0 {
		return ""
	}
	if contains(contentTypes, "application/json") {
		return "application/json"
	}
	return contentTypes[0] // use the first content type specified in 'consumes'
}

// selectHeaderAccept join all accept types and return
func selectHeaderAccept(accepts []string) string {
	if len(accepts) == 0 {
		return ""
	}

	if contains(accepts, "application/json") {
		return "application/json"
	}

	return strings.Join(accepts, ",")
}

// contains is a case insenstive match, finding needle in a haystack
func contains(haystack []string, needle string) bool {
	for _, a := range haystack {
		if strings.ToLower(a) == strings.ToLower(needle) {
			return true
		}
	}
	return false
}

// Verify optional parameters are of the correct type.
func typeCheckParameter(obj interface{}, expected string, name string) error {
	// Make sure there is an object.
	if obj == nil {
		return nil
	}

	// Check the type is as expected.
	if reflect.TypeOf(obj).String() != expected {
		return fmt.Errorf("Expected %s to be of type %s but received %s.", name, expected, reflect.TypeOf(obj).String())
	}
	return nil
}

// parameterToString convert interface{} parameters to string, using a delimiter if format is provided.
func parameterToString(obj interface{}, collectionFormat string) string {
	var delimiter string

	switch collectionFormat {
	case "pipes":
		delimiter = "|"
	case "ssv":
		delimiter = " "
	case "tsv":
		delimiter = "\t"
	case "csv":
		delimiter = ","
	}

	if reflect.TypeOf(obj).Kind() == reflect.Slice {
		return strings.Trim(strings.Replace(fmt.Sprint(obj), " ", delimiter, -1), "[]")
	}

	return fmt.Sprintf("%v", obj)
}

// callAPI do the request. 
func (c *APIClient) callAPI(request *http.Request) (*http.Response, error) {
	 return c.cfg.HTTPClient.Do(request)
}

// Change base path to allow switching to mocks
func (c *APIClient) ChangeBasePath (path string) {
	c.cfg.BasePath = path
}

// prepareRequest build the request
func (c *APIClient) prepareRequest (
	ctx context.Context,
	path string, method string,
	postBody interface{},
	headerParams map[string]string,
	queryParams url.Values,
	formParams url.Values,
	fileName string,
	fileBytes []byte) (localVarRequest *http.Request, err error) {

	var body *bytes.Buffer

	// Detect postBody type and post.
	if postBody != nil {
		contentType := headerParams["Content-Type"]
		if contentType == "" {
			contentType = detectContentType(postBody)
			headerParams["Content-Type"] = contentType
		}

		body, err = setBody(postBody, contentType)
		if err != nil {
			return nil, err
		}
	}

	// add form parameters and file if available.
	if len(formParams) > 0 || (len(fileBytes) > 0 && fileName != "") {
		if body != nil {
			return nil, errors.New("Cannot specify postBody and multipart form at the same time.")
		}
		body = &bytes.Buffer{}
		w := multipart.NewWriter(body)

		for k, v := range formParams {
			for _, iv := range v {
				if strings.HasPrefix(k, "@") { // file
					err = addFile(w, k[1:], iv)
					if err != nil {
						return nil, err
					}
				} else { // form value
					w.WriteField(k, iv)
				}
			}
		}
		if len(fileBytes) > 0 && fileName != "" {
			w.Boundary()
			//_, fileNm := filepath.Split(fileName)
			part, err := w.CreateFormFile("file", filepath.Base(fileName))
			if err != nil {
				return nil, err
			}
			_, err = part.Write(fileBytes)
			if err != nil {
				return nil, err
			}
			// Set the Boundary in the Content-Type
			headerParams["Content-Type"] = w.FormDataContentType()
		}
		
		// Set Content-Length
		headerParams["Content-Length"] = fmt.Sprintf("%d", body.Len())
		w.Close()
	}

	// Setup path and query parameters
	url, err := url.Parse(path)
	if err != nil {
		return nil, err
	}

	// Adding Query Param
	query := url.Query()
	for k, v := range queryParams {
		for _, iv := range v {
			query.Add(k, iv)
		}
	}

	// Encode the parameters.
	url.RawQuery = query.Encode()

	// Generate a new request
	if body != nil {
		localVarRequest, err = http.NewRequest(method, url.String(), body)
	} else {
		localVarRequest, err = http.NewRequest(method, url.String(), nil)
	}
	if err != nil {
		return nil, err
	}

	// add header parameters, if any
	if len(headerParams) > 0 {
		headers := http.Header{}
		for h, v := range headerParams {
			headers.Set(h, v)
		}
		localVarRequest.Header = headers
	}

	// Override request host, if applicable
	if c.cfg.Host != "" {
		localVarRequest.Host = c.cfg.Host
	}
	
	// Add the user agent to the request.
	localVarRequest.Header.Add("User-Agent", c.cfg.UserAgent)
	

	if ctx != nil {
		// add context to the request
		localVarRequest = localVarRequest.WithContext(ctx)

		// Walk through any authentication.

		// OAuth2 authentication
		if tok, ok := ctx.Value(ContextOAuth2).(oauth2.TokenSource); ok {
			// We were able to grab an oauth2 token from the context
			var latestToken *oauth2.Token
			if latestToken, err = tok.Token(); err != nil {
				return nil, err
			}

			latestToken.SetAuthHeader(localVarRequest)
		}

		// Basic HTTP Authentication
		if auth, ok := ctx.Value(ContextBasicAuth).(BasicAuth); ok {
			localVarRequest.SetBasicAuth(auth.UserName, auth.Password)
		}

		// AccessToken Authentication
		if auth, ok := ctx.Value(ContextAccessToken).(string); ok {
			localVarRequest.Header.Add("Authorization", "Bearer " + auth)
		}
	}

	for header, value := range c.cfg.DefaultHeader {
		localVarRequest.Header.Add(header, value)
	}
	
	return localVarRequest, nil
}


// Add a file to the multipart request
func addFile(w *multipart.Writer, fieldName, path string) error {
	file, err := os.Open(path)
	if err != nil {
		return err
	}
	defer file.Close()

	part, err := w.CreateFormFile(fieldName, filepath.Base(path))
	if err != nil {
		return err
	}
	_, err = io.Copy(part, file)

	return err
}

// Prevent trying to import "fmt"
func reportError(format string, a ...interface{}) (error) {
	return fmt.Errorf(format, a...)
}

// Set request body from an interface{}
func setBody(body interface{}, contentType string) (bodyBuf *bytes.Buffer, err error) {
	if bodyBuf == nil {
		bodyBuf = &bytes.Buffer{}
	}

	if reader, ok := body.(io.Reader); ok {
		_, err = bodyBuf.ReadFrom(reader)
	} else if b, ok := body.([]byte); ok {
		_, err = bodyBuf.Write(b)
	} else if s, ok := body.(string); ok {
		_, err = bodyBuf.WriteString(s)
	} else if jsonCheck.MatchString(contentType) {
		err = json.NewEncoder(bodyBuf).Encode(body)
	} else if xmlCheck.MatchString(contentType) {
		xml.NewEncoder(bodyBuf).Encode(body)
	}

	if err != nil {
		return nil, err
	}

	if bodyBuf.Len() == 0 {
		err = fmt.Errorf("Invalid body type %s\n", contentType)
		return nil, err
	}
	return bodyBuf, nil
}

// detectContentType method is used to figure out `Request.Body` content type for request header
func detectContentType(body interface{}) string {
	contentType := "text/plain; charset=utf-8"
	kind := reflect.TypeOf(body).Kind()
	
	switch kind {
	case reflect.Struct, reflect.Map, reflect.Ptr:
		contentType = "application/json; charset=utf-8"
	case reflect.String:
		contentType = "text/plain; charset=utf-8"
	default:
		if b, ok := body.([]byte); ok {
			contentType = http.DetectContentType(b)
		} else if kind == reflect.Slice {
			contentType = "application/json; charset=utf-8"
		}
	}

	return contentType
}


// Ripped from https://github.com/gregjones/httpcache/blob/master/httpcache.go
type cacheControl map[string]string

func parseCacheControl(headers http.Header) cacheControl {
	cc := cacheControl{}
	ccHeader := headers.Get("Cache-Control")
	for _, part := range strings.Split(ccHeader, ",") {
		part = strings.Trim(part, " ")
		if part == "" {
			continue
		}
		if strings.ContainsRune(part, '=') {
			keyval := strings.Split(part, "=")
			cc[strings.Trim(keyval[0], " ")] = strings.Trim(keyval[1], ",")
		} else {
			cc[part] = ""
		}
	}
	return cc
}

// CacheExpires helper function to determine remaining time before repeating a request.
func CacheExpires(r *http.Response) (time.Time) {
	// Figure out when the cache expires.
	var expires time.Time
	now, err := time.Parse(time.RFC1123, r.Header.Get("date"))
	if err != nil {
		return time.Now()
	}
	respCacheControl := parseCacheControl(r.Header)
	
	if maxAge, ok := respCacheControl["max-age"]; ok {
		lifetime, err := time.ParseDuration(maxAge + "s")
		if err != nil {
			expires = now
		}
		expires = now.Add(lifetime)
	} else {
		expiresHeader := r.Header.Get("Expires")
		if expiresHeader != "" {
			expires, err = time.Parse(time.RFC1123, expiresHeader)
			if err != nil {
				expires = now
			}
		}
	}
	return expires
}

func strlen(s string) (int) {
	return utf8.RuneCountInString(s)
}