terraform-provider-stackitprivatepreview/pkg/albbeta/client.go

/*
STACKIT Application Load Balancer API

### DEPRECATED! This API offers an interface to provision and manage load balancing servers in your STACKIT project. It also has the possibility of pooling target servers for load balancing purposes.  For each application load balancer provided, two VMs are deployed in your OpenStack project subject to a fee.

API version: 2beta2.0.0
*/

// Code generated by OpenAPI Generator (https://openapi-generator.tech); DO NOT EDIT.

package albbeta

import (
	"bytes"
	"context"
	"encoding/json"
	"encoding/xml"
	"fmt"
	"io"
	"log"
	"mime/multipart"
	"net/http"
	"net/http/httputil"
	"net/url"
	"os"
	"path/filepath"
	"reflect"
	"regexp"
	"strconv"
	"strings"
	"time"
	"unicode/utf8"

	"github.com/stackitcloud/stackit-sdk-go/core/auth"
	"github.com/stackitcloud/stackit-sdk-go/core/config"
)

var (
	jsonCheck       = regexp.MustCompile(`(?i:(?:application|text)/(?:vnd\.[^;]+\+)?json)`)
	xmlCheck        = regexp.MustCompile(`(?i:(?:application|text)/xml)`)
	queryParamSplit = regexp.MustCompile(`(^|&)([^&]+)`)
	queryDescape    = strings.NewReplacer("%5B", "[", "%5D", "]")
)

// APIClient manages communication with the STACKIT Application Load Balancer API API v2beta2.0.0
// In most cases there should be only one, shared, APIClient.
type APIClient struct {
	cfg        *config.Configuration
	common     service // Reuse a single struct instead of allocating one for each service on the heap.
	defaultApi *DefaultApiService
}

type service struct {
	client DefaultApi
}

// NewAPIClient creates a new API client.
// Optionally receives configuration options
func NewAPIClient(opts ...config.ConfigurationOption) (*APIClient, error) {
	cfg := NewConfiguration()

	for _, option := range opts {
		err := option(cfg)
		if err != nil {
			return nil, fmt.Errorf("configuring the client: %w", err)
		}
	}

	err := config.ConfigureRegion(cfg)
	if err != nil {
		return nil, fmt.Errorf("configuring region: %w", err)
	}

	if cfg.HTTPClient == nil {
		cfg.HTTPClient = &http.Client{}
	}

	authRoundTripper, err := auth.SetupAuth(cfg)
	if err != nil {
		return nil, fmt.Errorf("setting up authentication: %w", err)
	}

	roundTripper := authRoundTripper
	if cfg.Middleware != nil {
		roundTripper = config.ChainMiddleware(roundTripper, cfg.Middleware...)
	}

	cfg.HTTPClient.Transport = roundTripper

	c := &APIClient{}
	c.cfg = cfg
	c.common.client = c
	c.defaultApi = (*DefaultApiService)(&c.common)

	return c, nil
}

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 insensitive match, finding needle in a haystack
func contains(haystack []string, needle string) bool {
	for _, a := range haystack {
		if strings.EqualFold(a, 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
}

func ParameterValueToString(obj interface{}, key string) string {
	if reflect.TypeOf(obj).Kind() != reflect.Ptr {
		return fmt.Sprintf("%v", obj)
	}
	var param, ok = obj.(MappedNullable)
	if !ok {
		return ""
	}
	dataMap, err := param.ToMap()
	if err != nil {
		return ""
	}
	return fmt.Sprintf("%v", dataMap[key])
}

// parameterAddToHeaderOrQuery adds the provided object to the request header or url query
// supporting deep object syntax
func parameterAddToHeaderOrQuery(headerOrQueryParams interface{}, keyPrefix string, obj interface{}, collectionType string) {
	var v = reflect.ValueOf(obj)
	var value = ""
	if v == reflect.ValueOf(nil) {
		value = "null"
	} else {
		switch v.Kind() {
		case reflect.Invalid:
			value = "invalid"

		case reflect.Struct:
			if t, ok := obj.(MappedNullable); ok {
				dataMap, err := t.ToMap()
				if err != nil {
					return
				}
				parameterAddToHeaderOrQuery(headerOrQueryParams, keyPrefix, dataMap, collectionType)
				return
			}
			if t, ok := obj.(time.Time); ok {
				parameterAddToHeaderOrQuery(headerOrQueryParams, keyPrefix, t.Format(time.RFC3339), collectionType)
				return
			}
			value = v.Type().String() + " value"
		case reflect.Slice:
			var indValue = reflect.ValueOf(obj)
			if indValue == reflect.ValueOf(nil) {
				return
			}
			var lenIndValue = indValue.Len()
			for i := 0; i < lenIndValue; i++ {
				var arrayValue = indValue.Index(i)
				parameterAddToHeaderOrQuery(headerOrQueryParams, keyPrefix, arrayValue.Interface(), collectionType)
			}
			return

		case reflect.Map:
			var indValue = reflect.ValueOf(obj)
			if indValue == reflect.ValueOf(nil) {
				return
			}
			iter := indValue.MapRange()
			for iter.Next() {
				k, v := iter.Key(), iter.Value()
				parameterAddToHeaderOrQuery(headerOrQueryParams, fmt.Sprintf("%s[%s]", keyPrefix, k.String()), v.Interface(), collectionType)
			}
			return

		case reflect.Interface:
			fallthrough
		case reflect.Ptr:
			parameterAddToHeaderOrQuery(headerOrQueryParams, keyPrefix, v.Elem().Interface(), collectionType)
			return

		case reflect.Int, reflect.Int8, reflect.Int16,
			reflect.Int32, reflect.Int64:
			value = strconv.FormatInt(v.Int(), 10)
		case reflect.Uint, reflect.Uint8, reflect.Uint16,
			reflect.Uint32, reflect.Uint64, reflect.Uintptr:
			value = strconv.FormatUint(v.Uint(), 10)
		case reflect.Float32, reflect.Float64:
			value = strconv.FormatFloat(v.Float(), 'g', -1, 32)
		case reflect.Bool:
			value = strconv.FormatBool(v.Bool())
		case reflect.String:
			value = v.String()
		default:
			value = v.Type().String() + " value"
		}
	}

	switch valuesMap := headerOrQueryParams.(type) {
	case url.Values:
		if collectionType == "csv" && valuesMap.Get(keyPrefix) != "" {
			valuesMap.Set(keyPrefix, valuesMap.Get(keyPrefix)+","+value)
		} else {
			valuesMap.Add(keyPrefix, value)
		}
		break
	case map[string]string:
		valuesMap[keyPrefix] = value
		break
	}
}

// helper for converting interface{} parameters to json strings
func parameterToJson(obj interface{}) (string, error) {
	jsonBuf, err := json.Marshal(obj)
	if err != nil {
		return "", err
	}
	return string(jsonBuf), err
}

// callAPI do the request.
func (c *APIClient) callAPI(request *http.Request) (*http.Response, error) {
	if c.cfg.Debug {
		dump, err := httputil.DumpRequestOut(request, true)
		if err != nil {
			return nil, err
		}
		log.Printf("\n%s\n", string(dump))
	}

	resp, err := c.cfg.HTTPClient.Do(request)
	if err != nil {
		return resp, err
	}

	if c.cfg.Debug {
		dump, err := httputil.DumpResponse(resp, true)
		if err != nil {
			return resp, err
		}
		log.Printf("\n%s\n", string(dump))
	}
	return resp, err
}

// Allow modification of underlying config for alternate implementations and testing
// Caution: modifying the configuration while live can cause data races and potentially unwanted behavior
func (c *APIClient) GetConfig() *config.Configuration {
	return c.cfg
}

type formFile struct {
	fileBytes    []byte
	fileName     string
	formFileName string
}

// 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,
	formFiles []formFile) (localVarRequest *http.Request, err error) {

	var body *bytes.Buffer

	// Detect postBody type and post.
	if !IsNil(postBody) {
		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 strings.HasPrefix(headerParams["Content-Type"], "multipart/form-data") && len(formParams) > 0 || (len(formFiles) > 0) {
		if body != nil {
			return nil, fmt.Errorf("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)
				}
			}
		}
		for _, formFile := range formFiles {
			if len(formFile.fileBytes) > 0 && formFile.fileName != "" {
				w.Boundary()
				part, err := w.CreateFormFile(formFile.formFileName, filepath.Base(formFile.fileName))
				if err != nil {
					return nil, err
				}
				_, err = part.Write(formFile.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()
	}

	if strings.HasPrefix(headerParams["Content-Type"], "application/x-www-form-urlencoded") && len(formParams) > 0 {
		if body != nil {
			return nil, fmt.Errorf("cannot specify postBody and x-www-form-urlencoded form at the same time.")
		}
		body = &bytes.Buffer{}
		body.WriteString(formParams.Encode())
		// Set Content-Length
		headerParams["Content-Length"] = fmt.Sprintf("%d", body.Len())
	}

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

	// Override request host, if applicable
	if c.cfg.Host != "" {
		url.Host = c.cfg.Host
	}

	// Override request scheme, if applicable
	if c.cfg.Scheme != "" {
		url.Scheme = c.cfg.Scheme
	}

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

	// Encode the parameters.
	url.RawQuery = queryParamSplit.ReplaceAllStringFunc(query.Encode(), func(s string) string {
		pieces := strings.Split(s, "=")
		pieces[0] = queryDescape.Replace(pieces[0])
		return strings.Join(pieces, "=")
	})

	// 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[h] = []string{v}
		}
		localVarRequest.Header = headers
	}

	// 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.

	}

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

func (c *APIClient) decode(v interface{}, b []byte, contentType string) (err error) {
	if len(b) == 0 {
		return nil
	}
	if s, ok := v.(*string); ok {
		*s = string(b)
		return nil
	}
	if f, ok := v.(*os.File); ok {
		f, err = os.CreateTemp("", "HttpClientFile")
		if err != nil {
			return
		}
		_, err = f.Write(b)
		if err != nil {
			return
		}
		_, err = f.Seek(0, io.SeekStart)
		return
	}
	if f, ok := v.(**os.File); ok {
		*f, err = os.CreateTemp("", "HttpClientFile")
		if err != nil {
			return
		}
		_, err = (*f).Write(b)
		if err != nil {
			return
		}
		_, err = (*f).Seek(0, io.SeekStart)
		return
	}
	if xmlCheck.MatchString(contentType) {
		if err = xml.Unmarshal(b, v); err != nil {
			return err
		}
		return nil
	}
	if jsonCheck.MatchString(contentType) {
		if actualObj, ok := v.(interface{ GetActualInstance() interface{} }); ok { // oneOf, anyOf schemas
			if unmarshalObj, ok := actualObj.(interface{ UnmarshalJSON([]byte) error }); ok { // make sure it has UnmarshalJSON defined
				if err = unmarshalObj.UnmarshalJSON(b); err != nil {
					return err
				}
			} else {
				return fmt.Errorf("unknown type with GetActualInstance but no unmarshalObj.UnmarshalJSON defined")
			}
		} else if err = json.Unmarshal(b, v); err != nil { // simple model
			return err
		}
		return nil
	}
	return fmt.Errorf("undefined response type")
}

// Add a file to the multipart request
func addFile(w *multipart.Writer, fieldName, path string) error {
	file, err := os.Open(filepath.Clean(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
}

// A wrapper for strict JSON decoding
func newStrictDecoder(data []byte) *json.Decoder {
	dec := json.NewDecoder(bytes.NewBuffer(data))
	dec.DisallowUnknownFields()
	return dec
}

// 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 fp, ok := body.(*os.File); ok {
		_, err = bodyBuf.ReadFrom(fp)
	} else if b, ok := body.([]byte); ok {
		_, err = bodyBuf.Write(b)
	} else if s, ok := body.(string); ok {
		_, err = bodyBuf.WriteString(s)
	} 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) {
		err = xml.NewEncoder(bodyBuf).Encode(body)
	}

	if err != nil {
		return nil, err
	}

	if bodyBuf.Len() == 0 {
		err = fmt.Errorf("invalid body type %s", 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
		} else {
			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)
}