refactor: move client to separate package

internal/provider/buildingblock.go → client/buildingblock.go

@@ -1,4 +1,12 @@
-package provider
+package client
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+)
 
 type MeshBuildingBlock struct {
 	ApiVersion string                    `json:"apiVersion" tfsdk:"api_version"`
@@ -40,3 +48,43 @@ type MeshBuildingBlockStatus struct {
 	Status  string                `json:"status" tfsdk:"status"`
 	Outputs []MeshBuildingBlockIO `json:"outputs" tfsdk:"outputs"`
 }
+
+func (c *MeshStackProviderClient) ReadBuildingBlock(uuid string) (*MeshBuildingBlock, error) {
+	if c.ensureValidToken() != nil {
+		return nil, errors.New(ERROR_AUTHENTICATION_FAILURE)
+	}
+
+	targetUrl := c.endpoints.BuildingBlocks.JoinPath(uuid)
+	req, err := http.NewRequest("GET", targetUrl.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	res, err := c.doAuthenticatedRequest(req)
+	if err != nil {
+		return nil, err
+	}
+
+	defer res.Body.Close()
+
+	data, err := io.ReadAll(res.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	if res.StatusCode == 404 {
+		return nil, nil
+	}
+
+	if res.StatusCode != 200 {
+		return nil, fmt.Errorf("unexpected status code: %d, %s", res.StatusCode, data)
+	}
+
+	var bb MeshBuildingBlock
+	err = json.Unmarshal(data, &bb)
+	if err != nil {
+		return nil, err
+	}
+
+	return &bb, nil
+}

client/client.go

@@ -0,0 +1,216 @@
+package client
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+)
+
+const (
+	apiMeshObjectsRoot = "/api/meshobjects"
+	loginEndpoint      = "/api/login"
+
+	ERROR_GENERIC_CLIENT_ERROR   = "client error"
+	ERROR_GENERIC_API_ERROR      = "api error"
+	ERROR_AUTHENTICATION_FAILURE = "Not authorized. Check api key and secret."
+	ERROR_ENDPOINT_LOOKUP        = "Could not fetch endpoints for meshStack."
+
+	CONTENT_TYPE_PROJECT               = "application/vnd.meshcloud.api.meshproject.v2.hal+json"
+	CONTENT_TYPE_TENANT                = "application/vnd.meshcloud.api.meshtenant.v3.hal+json"
+	CONTENT_TYPE_PROJECT_USER_BINDINGS = "application/vnd.meshcloud.api.meshprojectuserbinding.v1.hal+json"
+	CONTENT_TYPE_PROJECT_USER_BINDING  = "application/vnd.meshcloud.api.meshprojectuserbinding.v3.hal+json"
+)
+
+type MeshStackProviderClient struct {
+	url         *url.URL
+	httpClient  *http.Client
+	apiKey      string
+	apiSecret   string
+	token       string
+	tokenExpiry time.Time
+	endpoints   endpoints
+}
+
+type endpoints struct {
+	BuildingBlocks      *url.URL `json:"meshbuildingblocks"`
+	Projects            *url.URL `json:"meshprojects"`
+	ProjectUserBindings *url.URL `json:"meshprojectuserbindings"`
+	Tenants             *url.URL `json:"meshtenants"`
+}
+
+type loginResponse struct {
+	Token     string `json:"access_token"`
+	ExpireSec int    `json:"expires_in"`
+}
+
+func NewClient(rootUrl *url.URL, apiKey string, apiSecret string) (*MeshStackProviderClient, error) {
+	client := &MeshStackProviderClient{
+		url: rootUrl,
+		httpClient: &http.Client{
+			Timeout: time.Minute * 5,
+		},
+		apiKey:    apiKey,
+		apiSecret: apiSecret,
+		token:     "",
+	}
+
+	// TODO: lookup endpoints
+	client.endpoints = endpoints{
+		BuildingBlocks:      rootUrl.JoinPath(apiMeshObjectsRoot, "meshbuildingblocks"),
+		Projects:            rootUrl.JoinPath(apiMeshObjectsRoot, "meshprojects"),
+		ProjectUserBindings: rootUrl.JoinPath(apiMeshObjectsRoot, "meshprojectbindings", "userbindings"),
+		Tenants:             rootUrl.JoinPath(apiMeshObjectsRoot, "meshtenants"),
+	}
+
+	return client, nil
+}
+
+func (c *MeshStackProviderClient) login() error {
+	loginPath, err := url.JoinPath(c.url.String(), loginEndpoint)
+	if err != nil {
+		return err
+	}
+
+	formData := url.Values{}
+	formData.Set("client_id", c.apiKey)
+	formData.Set("client_secret", c.apiSecret)
+	formData.Set("grant_type", "client_credentials")
+
+	req, _ := http.NewRequest(http.MethodPost, loginPath, strings.NewReader(formData.Encode()))
+	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
+
+	res, err := c.httpClient.Do(req)
+
+	if err != nil || res.StatusCode != 200 {
+		return errors.New(ERROR_AUTHENTICATION_FAILURE)
+	}
+
+	defer res.Body.Close()
+
+	data, err := io.ReadAll(res.Body)
+	if err != nil {
+		return err
+	}
+
+	var loginResult loginResponse
+	err = json.Unmarshal(data, &loginResult)
+	if err != nil {
+		return err
+	}
+
+	c.token = fmt.Sprintf("Bearer %s", loginResult.Token)
+	c.tokenExpiry = time.Now().Add(time.Second * time.Duration(loginResult.ExpireSec))
+
+	return nil
+}
+
+func (c *MeshStackProviderClient) ensureValidToken() error {
+	if c.token == "" || time.Now().Add(time.Second*30).After(c.tokenExpiry) {
+		return c.login()
+	}
+	return nil
+}
+
+// nolint: unused
+func (c *MeshStackProviderClient) lookUpEndpoints() error {
+	if c.ensureValidToken() != nil {
+		return errors.New(ERROR_AUTHENTICATION_FAILURE)
+	}
+
+	meshObjectsPath, err := url.JoinPath(c.url.String(), apiMeshObjectsRoot)
+	if err != nil {
+		return err
+	}
+	meshObjects, _ := url.Parse(meshObjectsPath)
+
+	res, err := c.httpClient.Do(
+		&http.Request{
+			URL:    meshObjects,
+			Method: "GET",
+			Header: http.Header{
+				"Authorization": {c.token},
+			},
+		},
+	)
+
+	if err != nil {
+		return errors.New(ERROR_GENERIC_CLIENT_ERROR)
+	}
+
+	defer res.Body.Close()
+
+	if res.StatusCode != 200 {
+		return errors.New(ERROR_AUTHENTICATION_FAILURE)
+	}
+
+	data, err := io.ReadAll(res.Body)
+	if err != nil {
+		return err
+	}
+
+	var endpoints endpoints
+	err = json.Unmarshal(data, &endpoints)
+	if err != nil {
+		return err
+	}
+
+	c.endpoints = endpoints
+	return nil
+}
+
+func (c *MeshStackProviderClient) doAuthenticatedRequest(req *http.Request) (*http.Response, error) {
+	// ensure that headeres are initialized
+	if req.Header == nil {
+		req.Header = map[string][]string{}
+	}
+	req.Header.Set("User-Agent", "meshStack Terraform Provider")
+
+	// log request before adding auth
+	log.Println(req)
+
+	// add authentication
+	if c.ensureValidToken() != nil {
+		return nil, errors.New(ERROR_AUTHENTICATION_FAILURE)
+	}
+	req.Header.Set("Authorization", c.token)
+
+	res, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	log.Println(res)
+
+	return res, nil
+}
+
+func (c *MeshStackProviderClient) deleteMeshObject(targetUrl url.URL, expectedStatus int) error {
+	req, err := http.NewRequest("DELETE", targetUrl.String(), nil)
+	if err != nil {
+		return err
+	}
+
+	res, err := c.doAuthenticatedRequest(req)
+
+	if err != nil {
+		return errors.New(ERROR_GENERIC_CLIENT_ERROR)
+	}
+
+	defer res.Body.Close()
+
+	data, err := io.ReadAll(res.Body)
+	if err != nil {
+		return err
+	}
+
+	if res.StatusCode != expectedStatus {
+		return fmt.Errorf("unexpected status code: %d, %s", res.StatusCode, data)
+	}
+
+	return nil
+}