feat(discovery): provider-agnostic cloud discovery — AWS + GCP adapters (#5)

#5 三项 DoD 全部落地(纯 Go,无云 SDK,REST + std crypto,非 mock):

- 抽象 provider 接口(DoD #3):cloudDiscoveryProvider{ name, discover } + 统一
  upsertDiscoveredCloudResources + 跨云一致分类 classifyCloudResourceType(vm/
  database/blob/cloud_resource)。新增 dispatcher DiscoverCloudResources 按
  account.Provider 路由 azure/aws/gcp。Azure 适配器复用既有 ARM 客户端,三家同抽象。
- AWS adapter(DoD #1):纯 Go AWS Signature V4(crypto/hmac+sha256)+ Resource
  Groups Tagging API GetResources(分页)→ ARN 归一化。SigV4 实现以 AWS 官方
  "get-vanilla" 测试向量验证签名正确(TestAWSSigV4_VanillaVector)。
- GCP adapter(DoD #2):服务账号 RS256 JWT 断言 → OAuth2 token → Cloud Asset
  Inventory searchAllResources(分页)→ asset 归一化。JWT 以生成密钥 RS256 验签
  roundtrip 验证(TestBuildGCPAssertion_RS256Roundtrip)。

路由:新增 POST /api/resources/:id/discover-cloud(按 provider 路由);保留既有
/:id/azure/discover 向后兼容。落库与 Azure 一致(resource_type=cloud_resource,
跨云类别入 metadata.classified_type),幂等 upsert(user+type+provider+external_id)。

测试:分类 / ARN 解析 / SigV4 官方向量 / GCP RS256 roundtrip;controller 全套通过,
go build/vet 干净。

Affects: Manager only(资源发现,新增只读发现端点 + 抽象层)。无计费/审计/部署改动;
凭据经既有 secret store 读取,不落明文。

Closes #5

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

heicode/controller/aws_resource_discovery.go

@@ -0,0 +1,298 @@
+package controller
+
+import (
+	"bytes"
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/heicode/manager/common"
+	"github.com/heicode/manager/model"
+)
+
+// AWS resource discovery (#5). Pure-Go AWS Signature V4 (no AWS SDK), mirroring
+// the REST approach of azure_resource_discovery.go. Uses the Resource Groups
+// Tagging API GetResources (AWS JSON 1.1) to enumerate the account's tagged
+// resources across services, then normalizes ARNs to discoveredCloudResource.
+//
+// Creds (from cloud_account metadata/secret): access_key_id, secret_access_key,
+// region, optional session_token.
+
+type awsCloudDiscoveryProvider struct{}
+
+func (awsCloudDiscoveryProvider) name() string { return "aws" }
+
+type awsDiscoveryCredentials struct {
+	AccessKeyID     string
+	SecretAccessKey string
+	SessionToken    string
+	Region          string
+}
+
+func (c awsDiscoveryCredentials) validate() error {
+	if strings.TrimSpace(c.AccessKeyID) == "" {
+		return errors.New("AWS access_key_id required")
+	}
+	if strings.TrimSpace(c.SecretAccessKey) == "" {
+		return errors.New("AWS secret_access_key required")
+	}
+	if strings.TrimSpace(c.Region) == "" {
+		return errors.New("AWS region required")
+	}
+	return nil
+}
+
+func (awsCloudDiscoveryProvider) discover(account model.ResourceBinding, creds map[string]any) ([]discoveredCloudResource, error) {
+	// region may live on the binding's external_id when not in creds.
+	if mapString(creds, "region") == "" && strings.TrimSpace(account.ExternalId) != "" {
+		creds["region"] = account.ExternalId
+	}
+	return discoverAWS(creds, time.Now(), &http.Client{Timeout: 20 * time.Second})
+}
+
+// hmacSHA256 / sha256Hex — SigV4 primitives.
+func hmacSHA256(key, data []byte) []byte {
+	h := hmac.New(sha256.New, key)
+	h.Write(data)
+	return h.Sum(nil)
+}
+
+func sha256Hex(data []byte) string {
+	sum := sha256.Sum256(data)
+	return hex.EncodeToString(sum[:])
+}
+
+// awsSigV4Authorization computes the SigV4 Authorization header value + x-amz-date
+// for the given request. signHeaders are the headers (besides host/x-amz-date) to
+// include in the signature (e.g. content-type, x-amz-target). Pure & deterministic
+// given t — verified against AWS's official "get-vanilla" test vector.
+func awsSigV4Authorization(method, rawURL string, signHeaders map[string]string, payload []byte,
+	cred awsDiscoveryCredentials, service string, t time.Time) (authorization, amzDate string, err error) {
+
+	u, err := url.Parse(rawURL)
+	if err != nil {
+		return "", "", err
+	}
+	amzDate = t.UTC().Format("20060102T150405Z")
+	dateStamp := t.UTC().Format("20060102")
+
+	// Canonical headers must include host + x-amz-date. Lowercase names, trim values, sort.
+	headers := map[string]string{}
+	for k, v := range signHeaders {
+		headers[strings.ToLower(strings.TrimSpace(k))] = strings.TrimSpace(v)
+	}
+	headers["host"] = u.Host
+	headers["x-amz-date"] = amzDate
+	if strings.TrimSpace(cred.SessionToken) != "" {
+		headers["x-amz-security-token"] = strings.TrimSpace(cred.SessionToken)
+	}
+	names := make([]string, 0, len(headers))
+	for k := range headers {
+		names = append(names, k)
+	}
+	sort.Strings(names)
+	var canonicalHeaders strings.Builder
+	for _, n := range names {
+		canonicalHeaders.WriteString(n + ":" + headers[n] + "\n")
+	}
+	signedHeaders := strings.Join(names, ";")
+
+	canonicalURI := u.EscapedPath()
+	if canonicalURI == "" {
+		canonicalURI = "/"
+	}
+	// Canonical query string: sort by key, RFC3986-encoded.
+	canonicalQuery := canonicalizeQuery(u.Query())
+
+	payloadHash := sha256Hex(payload)
+	canonicalRequest := method + "\n" + canonicalURI + "\n" + canonicalQuery + "\n" +
+		canonicalHeaders.String() + "\n" + signedHeaders + "\n" + payloadHash
+
+	credentialScope := dateStamp + "/" + cred.Region + "/" + service + "/aws4_request"
+	stringToSign := "AWS4-HMAC-SHA256\n" + amzDate + "\n" + credentialScope + "\n" + sha256Hex([]byte(canonicalRequest))
+
+	kDate := hmacSHA256([]byte("AWS4"+cred.SecretAccessKey), []byte(dateStamp))
+	kRegion := hmacSHA256(kDate, []byte(cred.Region))
+	kService := hmacSHA256(kRegion, []byte(service))
+	kSigning := hmacSHA256(kService, []byte("aws4_request"))
+	signature := hex.EncodeToString(hmacSHA256(kSigning, []byte(stringToSign)))
+
+	authorization = fmt.Sprintf("AWS4-HMAC-SHA256 Credential=%s/%s, SignedHeaders=%s, Signature=%s",
+		cred.AccessKeyID, credentialScope, signedHeaders, signature)
+	return authorization, amzDate, nil
+}
+
+func canonicalizeQuery(values url.Values) string {
+	if len(values) == 0 {
+		return ""
+	}
+	keys := make([]string, 0, len(values))
+	for k := range values {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	parts := make([]string, 0, len(keys))
+	for _, k := range keys {
+		vs := append([]string(nil), values[k]...)
+		sort.Strings(vs)
+		for _, v := range vs {
+			parts = append(parts, awsURIEncode(k, true)+"="+awsURIEncode(v, true))
+		}
+	}
+	return strings.Join(parts, "&")
+}
+
+// awsURIEncode is RFC3986 percent-encoding per SigV4 rules.
+func awsURIEncode(s string, encodeSlash bool) string {
+	var b strings.Builder
+	for _, c := range []byte(s) {
+		switch {
+		case (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') ||
+			c == '-' || c == '_' || c == '.' || c == '~':
+			b.WriteByte(c)
+		case c == '/' && !encodeSlash:
+			b.WriteByte(c)
+		default:
+			b.WriteString(fmt.Sprintf("%%%02X", c))
+		}
+	}
+	return b.String()
+}
+
+// awsResourceTagMapping is one entry of the Resource Groups Tagging API response.
+type awsResourceTagMapping struct {
+	ResourceARN string `json:"ResourceARN"`
+	Tags        []struct {
+		Key   string `json:"Key"`
+		Value string `json:"Value"`
+	} `json:"Tags"`
+}
+
+type awsGetResourcesResponse struct {
+	ResourceTagMappingList []awsResourceTagMapping `json:"ResourceTagMappingList"`
+	PaginationToken        string                  `json:"PaginationToken"`
+}
+
+// discoverAWS enumerates the account's tagged resources via the Resource Groups
+// Tagging API (paginated). Real implementation (no mock).
+func discoverAWS(creds map[string]any, now time.Time, httpClient *http.Client) ([]discoveredCloudResource, error) {
+	cred := awsDiscoveryCredentials{
+		AccessKeyID:     mapString(creds, "access_key_id"),
+		SecretAccessKey: mapString(creds, "secret_access_key"),
+		SessionToken:    mapString(creds, "session_token"),
+		Region:          mapString(creds, "region"),
+	}
+	if err := cred.validate(); err != nil {
+		return nil, err
+	}
+	endpoint := fmt.Sprintf("https://tagging.%s.amazonaws.com/", cred.Region)
+	const target = "ResourceGroupsTaggingAPI_20170126.GetResources"
+
+	out := []discoveredCloudResource{}
+	paginationToken := ""
+	for page := 0; page < 50; page++ {
+		bodyMap := map[string]any{"ResourcesPerPage": 100}
+		if paginationToken != "" {
+			bodyMap["PaginationToken"] = paginationToken
+		}
+		body, err := common.Marshal(bodyMap)
+		if err != nil {
+			return nil, err
+		}
+		signHeaders := map[string]string{
+			"content-type": "application/x-amz-json-1.1",
+			"x-amz-target": target,
+		}
+		auth, amzDate, err := awsSigV4Authorization(http.MethodPost, endpoint, signHeaders, body, cred, "tagging", now)
+		if err != nil {
+			return nil, err
+		}
+		req, err := http.NewRequest(http.MethodPost, endpoint, bytes.NewReader(body))
+		if err != nil {
+			return nil, err
+		}
+		req.Header.Set("Content-Type", "application/x-amz-json-1.1")
+		req.Header.Set("X-Amz-Target", target)
+		req.Header.Set("X-Amz-Date", amzDate)
+		req.Header.Set("Authorization", auth)
+		if strings.TrimSpace(cred.SessionToken) != "" {
+			req.Header.Set("X-Amz-Security-Token", cred.SessionToken)
+		}
+		resp, err := httpClient.Do(req)
+		if err != nil {
+			return nil, fmt.Errorf("AWS GetResources request failed: %w", err)
+		}
+		raw, _ := io.ReadAll(io.LimitReader(resp.Body, 8<<20))
+		resp.Body.Close()
+		if resp.StatusCode < http.StatusOK || resp.StatusCode >= http.StatusMultipleChoices {
+			return nil, fmt.Errorf("AWS GetResources failed (%d): %s", resp.StatusCode, strings.TrimSpace(string(raw)))
+		}
+		var payload awsGetResourcesResponse
+		if err := common.Unmarshal(raw, &payload); err != nil {
+			return nil, err
+		}
+		for _, m := range payload.ResourceTagMappingList {
+			if d, ok := awsARNToResource(m.ResourceARN); ok {
+				tags := map[string]any{}
+				for _, t := range m.Tags {
+					tags[t.Key] = t.Value
+				}
+				d.Metadata = map[string]any{"region": cred.Region, "tags": tags}
+				out = append(out, d)
+			}
+		}
+		paginationToken = strings.TrimSpace(payload.PaginationToken)
+		if paginationToken == "" {
+			break
+		}
+	}
+	return out, nil
+}
+
+// awsARNToResource parses arn:partition:service:region:account:resource into a
+// normalized resource. NativeType is CloudFormation-style (AWS::<Service>::<Type>)
+// so classifyCloudResourceType maps it to vm/database/blob consistently.
+func awsARNToResource(arn string) (discoveredCloudResource, bool) {
+	arn = strings.TrimSpace(arn)
+	if !strings.HasPrefix(arn, "arn:") {
+		return discoveredCloudResource{}, false
+	}
+	parts := strings.SplitN(arn, ":", 6)
+	if len(parts) < 6 {
+		return discoveredCloudResource{}, false
+	}
+	service := parts[2]
+	region := parts[3]
+	resource := parts[5]
+	// resource may be "type/id", "type:id", or just "id" (e.g. s3 bucket).
+	resType, resName := "", resource
+	if i := strings.IndexAny(resource, "/:"); i >= 0 {
+		resType = resource[:i]
+		resName = resource[i+1:]
+	}
+	native := "AWS::" + strings.ToUpper(service)
+	if resType != "" {
+		native += "::" + resType
+	} else if strings.EqualFold(service, "s3") {
+		native += "::Bucket"
+	}
+	name := resName
+	if name == "" {
+		name = arn
+	}
+	return discoveredCloudResource{
+		ExternalId:   arn,
+		Name:         name,
+		NativeType:   native,
+		Location:     region,
+		BindingScope: "aws:" + arn,
+	}, true
+}

heicode/controller/cloud_resource_discovery.go

@@ -0,0 +1,259 @@
+package controller
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"github.com/heicode/manager/common"
+	"github.com/heicode/manager/model"
+	"gorm.io/gorm"
+)
+
+// Cloud resource discovery — provider-agnostic layer (#5).
+//
+// 历史上只有 Azure 发现（controller/azure_resource_discovery.go，硬要求 provider==azure）。
+// 本文件抽象出统一的 provider 接口，让 AWS / GCP 走同一条「发现 → 归一化 → 落库」路径，
+// 并对 vm / database / blob 做跨云一致的分类（DoD #3）。Azure 适配器复用既有 ARM 客户端，
+// 故三家行为一致；具体云的签名/鉴权在 aws_resource_discovery.go / gcp_resource_discovery.go。
+
+// discoveredCloudResource 是各 provider 适配器输出的**归一化**资源视图。upsert 时由统一
+// 路径补 source_account_id 与 classified_type，并写入 ResourceBinding(resource_type=cloud_resource)。
+type discoveredCloudResource struct {
+	ExternalId   string         // ARN / Azure resource id / GCP asset name —— 跨 provider 的稳定外部 id
+	Name         string         // 展示名
+	NativeType   string         // provider 原生类型字符串（如 Microsoft.Compute/virtualMachines、AWS::EC2::Instance、compute.googleapis.com/Instance）
+	Location     string         // region / location
+	BindingScope string         // 可选；为空时默认 "<provider>:<external_id>"
+	Metadata     map[string]any // provider 特定附加字段
+}
+
+// cloudDiscoveryProvider 是「连接云账号 → 列资源」的统一抽象（DoD #3）。
+type cloudDiscoveryProvider interface {
+	name() string
+	// discover 用 creds（已合并 metadata + secret JSON）列出 account 下的资源。
+	discover(account model.ResourceBinding, creds map[string]any) ([]discoveredCloudResource, error)
+}
+
+func cloudDiscoveryProviderByName(provider string) (cloudDiscoveryProvider, bool) {
+	switch strings.ToLower(strings.TrimSpace(provider)) {
+	case "azure":
+		return azureCloudDiscoveryProvider{}, true
+	case "aws", "amazon":
+		return awsCloudDiscoveryProvider{}, true
+	case "gcp", "google", "gce":
+		return gcpCloudDiscoveryProvider{}, true
+	}
+	return nil, false
+}
+
+// classifyCloudResourceType 把 provider 原生类型映射到跨云一致的逻辑类别（DoD #3）：
+// vm / database / blob / cloud_resource(兜底)。基于不区分大小写的子串匹配，覆盖三家常见服务。
+func classifyCloudResourceType(nativeType string) string {
+	t := strings.ToLower(nativeType)
+	containsAny := func(s string, subs ...string) bool {
+		for _, sub := range subs {
+			if strings.Contains(s, sub) {
+				return true
+			}
+		}
+		return false
+	}
+	switch {
+	// 数据库（放在 vm 之前：避免 "sqlvirtual..." 之类被误判为 vm；数据库特征更强）
+	case containsAny(t, "sql", "postgres", "mysql", "mariadb", "rds", "database", "cosmos",
+		"dynamodb", "spanner", "cloudsql", "bigtable", "redis", "documentdb", "memcache"):
+		return "database"
+	case containsAny(t, "virtualmachine", "ec2::instance", "ec2/instance", "compute/instance",
+		"compute.googleapis.com/instance", "virtualmachinescaleset", "instance"):
+		return "vm"
+	case containsAny(t, "storageaccount", "::s3::", "s3:::", "/buckets/", "storage/bucket",
+		"storage.googleapis.com/bucket", "blob", "bucket"):
+		return "blob"
+	default:
+		return "cloud_resource"
+	}
+}
+
+// upsertDiscoveredCloudResources 把归一化资源幂等写入 ResourceBinding（按 user+type+provider+external_id
+// 去重）。统一所有 provider 的落库格式：resource_type 固定为 cloud_resource（与既有 Azure 行为一致，
+// 不让发现的资源直接变成可绑定的 vm/db/blob），跨云类别放在 metadata.classified_type。
+func upsertDiscoveredCloudResources(account model.ResourceBinding, provider string, discovered []discoveredCloudResource) ([]resourceResponse, error) {
+	items := make([]resourceResponse, 0, len(discovered))
+	for _, d := range discovered {
+		if strings.TrimSpace(d.ExternalId) == "" {
+			continue
+		}
+		metadata := map[string]any{}
+		for k, v := range d.Metadata {
+			metadata[k] = v
+		}
+		metadata["source_account_id"] = account.Id
+		metadata["classified_type"] = classifyCloudResourceType(d.NativeType)
+		if strings.TrimSpace(d.NativeType) != "" {
+			metadata["native_type"] = d.NativeType
+		}
+		if strings.TrimSpace(d.Location) != "" {
+			metadata["location"] = d.Location
+		}
+		metadataJSON, err := marshalResourceJSON(metadata)
+		if err != nil {
+			return nil, err
+		}
+		permissionScopeJSON, err := marshalResourceJSON(map[string]any{"actions": []string{provider + ":read"}})
+		if err != nil {
+			return nil, err
+		}
+		constraintsJSON, err := marshalResourceJSON(unmarshalResourceJSON(account.Constraints))
+		if err != nil {
+			return nil, err
+		}
+		name := strings.TrimSpace(d.Name)
+		if name == "" {
+			name = d.ExternalId
+		}
+		bindingScope := strings.TrimSpace(d.BindingScope)
+		if bindingScope == "" {
+			bindingScope = fmt.Sprintf("%s:%s", provider, d.ExternalId)
+		}
+
+		var resource model.ResourceBinding
+		err = model.DB.Where(
+			"user_id = ? AND resource_type = ? AND provider = ? AND external_id = ?",
+			account.UserId, "cloud_resource", provider, d.ExternalId,
+		).First(&resource).Error
+		if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, err
+		}
+		resource.UserId = account.UserId
+		resource.TenantId = account.TenantId
+		resource.ProjectId = account.ProjectId
+		resource.BindingScope = bindingScope
+		resource.Name = name
+		resource.ResourceType = "cloud_resource"
+		resource.Provider = provider
+		resource.ExternalId = d.ExternalId
+		resource.SecretRef = account.SecretRef
+		resource.Metadata = metadataJSON
+		resource.PermissionScope = permissionScopeJSON
+		resource.Constraints = constraintsJSON
+		resource.Status = "active"
+		if resource.Id == 0 {
+			if err := model.DB.Create(&resource).Error; err != nil {
+				return nil, err
+			}
+		} else if err := model.DB.Save(&resource).Error; err != nil {
+			return nil, err
+		}
+		items = append(items, resourceToResponse(resource))
+	}
+	return items, nil
+}
+
+// DiscoverCloudResources: POST /api/resources/:id/discover-cloud — provider-agnostic
+// discovery dispatcher (#5). Routes by the account's provider to the matching
+// adapter (azure/aws/gcp), then upserts via the unified path.
+func DiscoverCloudResources(c *gin.Context) {
+	userId := c.GetInt("id")
+	var account model.ResourceBinding
+	if err := model.DB.Where("id = ? AND user_id = ?", c.Param("id"), userId).First(&account).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			common.ApiErrorMsg(c, "resource not found")
+			return
+		}
+		common.ApiError(c, err)
+		return
+	}
+	if account.ResourceType != "cloud_account" || account.Status != "active" {
+		common.ApiErrorMsg(c, "resource must be an active cloud_account")
+		return
+	}
+	impl, ok := cloudDiscoveryProviderByName(account.Provider)
+	if !ok {
+		common.ApiErrorMsg(c, "unsupported cloud provider: "+account.Provider+" (supported: azure, aws, gcp)")
+		return
+	}
+
+	// creds = metadata（非密）合并 secret JSON（密）。secret 优先级在适配器内部按需处理。
+	creds := unmarshalResourceJSON(account.Metadata)
+	if creds == nil {
+		creds = map[string]any{}
+	}
+	if strings.TrimSpace(account.SecretRef) != "" {
+		secretClient, err := newSecretStoreClientFromEnv()
+		if err != nil {
+			common.ApiError(c, err)
+			return
+		}
+		secretData, err := secretClient.getJSONSecret(account.SecretRef)
+		if err != nil {
+			common.ApiError(c, err)
+			return
+		}
+		for k, v := range secretData {
+			creds[k] = v // secret 覆盖同名非密字段
+		}
+	}
+
+	discovered, err := impl.discover(account, creds)
+	if err != nil {
+		common.ApiError(c, err)
+		return
+	}
+	items, err := upsertDiscoveredCloudResources(account, impl.name(), discovered)
+	if err != nil {
+		common.ApiError(c, err)
+		return
+	}
+	common.ApiSuccess(c, gin.H{
+		"account":    resourceToResponse(account),
+		"provider":   impl.name(),
+		"items":      items,
+		"discovered": len(items),
+	})
+}
+
+// azureCloudDiscoveryProvider 让既有 Azure ARM 发现实现统一接口（复用 azure_resource_discovery.go
+// 的 client/token/list），保证三家走同一抽象。
+type azureCloudDiscoveryProvider struct{}
+
+func (azureCloudDiscoveryProvider) name() string { return "azure" }
+
+func (azureCloudDiscoveryProvider) discover(account model.ResourceBinding, creds map[string]any) ([]discoveredCloudResource, error) {
+	cred := azureDiscoveryCredentials{
+		SubscriptionID: firstString(creds, nil, account.ExternalId, "subscription_id"),
+		TenantID:       firstString(creds, nil, account.TenantId, "tenant_id"),
+		ClientID:       mapString(creds, "client_id"),
+		ClientSecret:   mapString(creds, "client_secret"),
+	}
+	if err := cred.validate(); err != nil {
+		return nil, err
+	}
+	client := newAzureResourceDiscoveryClientFromEnv()
+	token, err := client.clientCredentialsToken(cred)
+	if err != nil {
+		return nil, err
+	}
+	arm, err := client.listSubscriptionResources(cred.SubscriptionID, token)
+	if err != nil {
+		return nil, err
+	}
+	out := make([]discoveredCloudResource, 0, len(arm))
+	for _, r := range arm {
+		out = append(out, discoveredCloudResource{
+			ExternalId:   r.ID,
+			Name:         r.Name,
+			NativeType:   r.Type,
+			Location:     r.Location,
+			BindingScope: fmt.Sprintf("azure:%s:%s", cred.SubscriptionID, r.ID),
+			Metadata: map[string]any{
+				"subscription_id": cred.SubscriptionID,
+				"tenant_id":       cred.TenantID,
+				"resource_group":  azureResourceGroupFromID(r.ID),
+				"tags":            r.Tags,
+			},
+		})
+	}
+	return out, nil
+}

heicode/controller/cloud_resource_discovery_test.go

@@ -0,0 +1,116 @@
+package controller
+
+import (
+	"crypto"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha256"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/pem"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+// #5: 跨云类别分类 vm/database/blob 一致。
+func TestClassifyCloudResourceType(t *testing.T) {
+	cases := map[string]string{
+		// vm
+		"Microsoft.Compute/virtualMachines":   "vm",
+		"AWS::EC2::Instance":                  "vm",
+		"compute.googleapis.com/Instance":     "vm",
+		// database
+		"Microsoft.Sql/servers/databases":     "database",
+		"AWS::RDS::DBInstance":                "database",
+		"sqladmin.googleapis.com/Instance":    "database",
+		"AWS::DynamoDB::Table":                "database",
+		// blob / object storage
+		"Microsoft.Storage/storageAccounts":   "blob",
+		"AWS::S3::Bucket":                     "blob",
+		"storage.googleapis.com/Bucket":       "blob",
+		// fallback
+		"Microsoft.Network/virtualNetworks":   "cloud_resource",
+		"AWS::IAM::Role":                      "cloud_resource",
+	}
+	for native, want := range cases {
+		require.Equal(t, want, classifyCloudResourceType(native), "classify %s", native)
+	}
+}
+
+// #5: ARN 解析 → 归一化 + 正确分类。
+func TestAWSARNToResource(t *testing.T) {
+	ec2, ok := awsARNToResource("arn:aws:ec2:us-east-1:123456789012:instance/i-0abc123")
+	require.True(t, ok)
+	require.Equal(t, "us-east-1", ec2.Location)
+	require.Equal(t, "i-0abc123", ec2.Name)
+	require.Equal(t, "vm", classifyCloudResourceType(ec2.NativeType))
+
+	s3, ok := awsARNToResource("arn:aws:s3:::my-bucket")
+	require.True(t, ok)
+	require.Equal(t, "my-bucket", s3.Name)
+	require.Equal(t, "blob", classifyCloudResourceType(s3.NativeType))
+
+	rds, ok := awsARNToResource("arn:aws:rds:eu-west-1:123:db:prod-pg")
+	require.True(t, ok)
+	require.Equal(t, "database", classifyCloudResourceType(rds.NativeType))
+
+	_, ok = awsARNToResource("not-an-arn")
+	require.False(t, ok)
+}
+
+// #5: SigV4 实现正确性 —— 对齐 AWS 官方 "get-vanilla" 测试向量。
+func TestAWSSigV4_VanillaVector(t *testing.T) {
+	cred := awsDiscoveryCredentials{
+		AccessKeyID:     "AKIDEXAMPLE",
+		SecretAccessKey: "wJalrXUtnFEMI/K7MDENG+bPxRfiCYEXAMPLEKEY",
+		Region:          "us-east-1",
+	}
+	tm := time.Date(2015, 8, 30, 12, 36, 0, 0, time.UTC)
+	auth, amzDate, err := awsSigV4Authorization("GET", "https://example.amazonaws.com/", map[string]string{}, []byte(""), cred, "service", tm)
+	require.NoError(t, err)
+	require.Equal(t, "20150830T123600Z", amzDate)
+	require.Contains(t, auth, "Credential=AKIDEXAMPLE/20150830/us-east-1/service/aws4_request")
+	require.Contains(t, auth, "SignedHeaders=host;x-amz-date")
+	// 官方向量期望签名
+	require.Contains(t, auth, "Signature=5fa00fa31553b73ebf1942676e86291e8372ff2a2260956d9b8aae1d763fbf31")
+}
+
+// #5: GCP SA JWT —— RS256 断言可被对应公钥验签,且 claims 正确。
+func TestBuildGCPAssertion_RS256Roundtrip(t *testing.T) {
+	key, err := rsa.GenerateKey(rand.Reader, 2048)
+	require.NoError(t, err)
+	der, err := x509.MarshalPKCS8PrivateKey(key)
+	require.NoError(t, err)
+	pemStr := string(pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: der}))
+
+	cred := gcpDiscoveryCredentials{
+		ClientEmail: "svc@proj.iam.gserviceaccount.com",
+		PrivateKey:  pemStr,
+		ProjectID:   "proj",
+	}
+	tm := time.Date(2026, 6, 10, 0, 0, 0, 0, time.UTC)
+	jwt, err := buildGCPAssertion(cred, "https://www.googleapis.com/auth/cloud-platform", "https://oauth2.googleapis.com/token", tm)
+	require.NoError(t, err)
+
+	parts := strings.Split(jwt, ".")
+	require.Len(t, parts, 3)
+
+	// 验签:signingInput = header.payload
+	signingInput := parts[0] + "." + parts[1]
+	digest := sha256.Sum256([]byte(signingInput))
+	sig, err := base64.RawURLEncoding.DecodeString(parts[2])
+	require.NoError(t, err)
+	require.NoError(t, rsa.VerifyPKCS1v15(&key.PublicKey, crypto.SHA256, digest[:], sig), "RS256 签名应可被公钥验证")
+
+	// header alg + claims
+	hdr, err := base64.RawURLEncoding.DecodeString(parts[0])
+	require.NoError(t, err)
+	require.Contains(t, string(hdr), "RS256")
+	claims, err := base64.RawURLEncoding.DecodeString(parts[1])
+	require.NoError(t, err)
+	require.Contains(t, string(claims), "svc@proj.iam.gserviceaccount.com")
+	require.Contains(t, string(claims), "cloud-platform")
+}

heicode/controller/gcp_resource_discovery.go

@@ -0,0 +1,230 @@
+package controller
+
+import (
+	"crypto"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha256"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/pem"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/heicode/manager/common"
+	"github.com/heicode/manager/model"
+)
+
+// GCP resource discovery (#5). Pure-Go service-account flow (no GCP SDK):
+// build an RS256-signed JWT assertion from the SA private key, exchange it for an
+// OAuth2 access token, then call Cloud Asset Inventory searchAllResources (REST)
+// to enumerate the project's resources. Normalizes assets to discoveredCloudResource.
+//
+// Creds (from cloud_account metadata/secret): client_email, private_key (PEM),
+// project_id. token_uri optional (defaults to Google's).
+
+type gcpCloudDiscoveryProvider struct{}
+
+func (gcpCloudDiscoveryProvider) name() string { return "gcp" }
+
+func (gcpCloudDiscoveryProvider) discover(account model.ResourceBinding, creds map[string]any) ([]discoveredCloudResource, error) {
+	if mapString(creds, "project_id") == "" && strings.TrimSpace(account.ExternalId) != "" {
+		creds["project_id"] = account.ExternalId
+	}
+	return discoverGCP(creds, time.Now(), &http.Client{Timeout: 20 * time.Second})
+}
+
+type gcpDiscoveryCredentials struct {
+	ClientEmail string
+	PrivateKey  string // PEM
+	ProjectID   string
+	TokenURI    string
+}
+
+func (c gcpDiscoveryCredentials) validate() error {
+	if strings.TrimSpace(c.ClientEmail) == "" {
+		return errors.New("GCP client_email required")
+	}
+	if strings.TrimSpace(c.PrivateKey) == "" {
+		return errors.New("GCP private_key required")
+	}
+	if strings.TrimSpace(c.ProjectID) == "" {
+		return errors.New("GCP project_id required")
+	}
+	return nil
+}
+
+func b64url(b []byte) string { return base64.RawURLEncoding.EncodeToString(b) }
+
+// parseRSAPrivateKeyPEM parses a PEM private key (PKCS#8 or PKCS#1) into an RSA key.
+func parseRSAPrivateKeyPEM(pemStr string) (*rsa.PrivateKey, error) {
+	block, _ := pem.Decode([]byte(strings.TrimSpace(pemStr)))
+	if block == nil {
+		return nil, errors.New("GCP private_key is not valid PEM")
+	}
+	if key, err := x509.ParsePKCS1PrivateKey(block.Bytes); err == nil {
+		return key, nil
+	}
+	keyAny, err := x509.ParsePKCS8PrivateKey(block.Bytes)
+	if err != nil {
+		return nil, fmt.Errorf("GCP private_key parse failed: %w", err)
+	}
+	rsaKey, ok := keyAny.(*rsa.PrivateKey)
+	if !ok {
+		return nil, errors.New("GCP private_key is not an RSA key")
+	}
+	return rsaKey, nil
+}
+
+// buildGCPAssertion builds the RS256-signed JWT assertion for the OAuth2 token
+// exchange. Pure & deterministic given t — unit-testable with a generated key.
+func buildGCPAssertion(cred gcpDiscoveryCredentials, scope string, aud string, t time.Time) (string, error) {
+	key, err := parseRSAPrivateKeyPEM(cred.PrivateKey)
+	if err != nil {
+		return "", err
+	}
+	header, err := common.Marshal(map[string]any{"alg": "RS256", "typ": "JWT"})
+	if err != nil {
+		return "", err
+	}
+	iat := t.UTC().Unix()
+	claims, err := common.Marshal(map[string]any{
+		"iss":   cred.ClientEmail,
+		"scope": scope,
+		"aud":   aud,
+		"iat":   iat,
+		"exp":   iat + 3600,
+	})
+	if err != nil {
+		return "", err
+	}
+	signingInput := b64url(header) + "." + b64url(claims)
+	digest := sha256.Sum256([]byte(signingInput))
+	sig, err := rsa.SignPKCS1v15(rand.Reader, key, crypto.SHA256, digest[:])
+	if err != nil {
+		return "", err
+	}
+	return signingInput + "." + b64url(sig), nil
+}
+
+func gcpAccessToken(cred gcpDiscoveryCredentials, t time.Time, httpClient *http.Client) (string, error) {
+	tokenURI := strings.TrimSpace(cred.TokenURI)
+	if tokenURI == "" {
+		tokenURI = "https://oauth2.googleapis.com/token"
+	}
+	assertion, err := buildGCPAssertion(cred, "https://www.googleapis.com/auth/cloud-platform", tokenURI, t)
+	if err != nil {
+		return "", err
+	}
+	form := url.Values{}
+	form.Set("grant_type", "urn:ietf:params:oauth:grant-type:jwt-bearer")
+	form.Set("assertion", assertion)
+	req, err := http.NewRequest(http.MethodPost, tokenURI, strings.NewReader(form.Encode()))
+	if err != nil {
+		return "", err
+	}
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("GCP token exchange failed: %w", err)
+	}
+	defer resp.Body.Close()
+	raw, _ := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
+	if resp.StatusCode < http.StatusOK || resp.StatusCode >= http.StatusMultipleChoices {
+		return "", fmt.Errorf("GCP token exchange failed (%d): %s", resp.StatusCode, strings.TrimSpace(string(raw)))
+	}
+	var payload struct {
+		AccessToken string `json:"access_token"`
+	}
+	if err := common.Unmarshal(raw, &payload); err != nil {
+		return "", err
+	}
+	if strings.TrimSpace(payload.AccessToken) == "" {
+		return "", errors.New("GCP token response missing access_token")
+	}
+	return payload.AccessToken, nil
+}
+
+type gcpAsset struct {
+	Name        string `json:"name"`
+	AssetType   string `json:"assetType"`
+	DisplayName string `json:"displayName"`
+	Location    string `json:"location"`
+}
+
+type gcpSearchResponse struct {
+	Results       []gcpAsset `json:"results"`
+	NextPageToken string     `json:"nextPageToken"`
+}
+
+func discoverGCP(creds map[string]any, now time.Time, httpClient *http.Client) ([]discoveredCloudResource, error) {
+	cred := gcpDiscoveryCredentials{
+		ClientEmail: mapString(creds, "client_email"),
+		PrivateKey:  mapString(creds, "private_key"),
+		ProjectID:   mapString(creds, "project_id"),
+		TokenURI:    mapString(creds, "token_uri"),
+	}
+	if err := cred.validate(); err != nil {
+		return nil, err
+	}
+	token, err := gcpAccessToken(cred, now, httpClient)
+	if err != nil {
+		return nil, err
+	}
+
+	scope := "projects/" + cred.ProjectID
+	base := "https://cloudasset.googleapis.com/v1/" + url.PathEscape(scope) + ":searchAllResources"
+	out := []discoveredCloudResource{}
+	pageToken := ""
+	for page := 0; page < 50; page++ {
+		endpoint := base + "?pageSize=500"
+		if pageToken != "" {
+			endpoint += "&pageToken=" + url.QueryEscape(pageToken)
+		}
+		req, err := http.NewRequest(http.MethodGet, endpoint, nil)
+		if err != nil {
+			return nil, err
+		}
+		req.Header.Set("Authorization", "Bearer "+token)
+		resp, err := httpClient.Do(req)
+		if err != nil {
+			return nil, fmt.Errorf("GCP searchAllResources failed: %w", err)
+		}
+		raw, _ := io.ReadAll(io.LimitReader(resp.Body, 8<<20))
+		resp.Body.Close()
+		if resp.StatusCode < http.StatusOK || resp.StatusCode >= http.StatusMultipleChoices {
+			return nil, fmt.Errorf("GCP searchAllResources failed (%d): %s", resp.StatusCode, strings.TrimSpace(string(raw)))
+		}
+		var payload gcpSearchResponse
+		if err := common.Unmarshal(raw, &payload); err != nil {
+			return nil, err
+		}
+		for _, a := range payload.Results {
+			if strings.TrimSpace(a.Name) == "" {
+				continue
+			}
+			name := strings.TrimSpace(a.DisplayName)
+			if name == "" {
+				name = lastPathSegment(a.Name)
+			}
+			out = append(out, discoveredCloudResource{
+				ExternalId:   a.Name,
+				Name:         name,
+				NativeType:   a.AssetType, // e.g. compute.googleapis.com/Instance
+				Location:     a.Location,
+				BindingScope: "gcp:" + a.Name,
+				Metadata:     map[string]any{"project_id": cred.ProjectID, "asset_type": a.AssetType},
+			})
+		}
+		pageToken = strings.TrimSpace(payload.NextPageToken)
+		if pageToken == "" {
+			break
+		}
+	}
+	return out, nil
+}

heicode/router/api-router.go

@@ -225,6 +225,9 @@ func SetApiRouter(router *gin.Engine) {
 			resourceRoute.POST("/", controller.CreateResource)
 			resourceRoute.POST("/:id/secret", controller.UpsertResourceSecret)
 			resourceRoute.POST("/:id/azure/discover", controller.DiscoverAzureResources)
+			// Provider-agnostic cloud discovery (#5): routes by the account's provider
+			// (azure/aws/gcp). The azure-specific route above is kept for back-compat.
+			resourceRoute.POST("/:id/discover-cloud", controller.DiscoverCloudResources)
 			resourceRoute.PUT("/:id", controller.UpdateResource)
 			resourceRoute.DELETE("/:id", controller.DeleteResource)
 		}