feat: HttpSignatureで署名を検証する実装を追加

src/main/kotlin/dev/usbharu/hideout/query/UserQueryService.kt

@@ -12,4 +12,5 @@ interface UserQueryService {
     suspend fun findByUrl(url: String): User
     suspend fun findByIds(ids: List<Long>): List<User>
     suspend fun existByNameAndDomain(name: String, domain: String): Boolean
+    suspend fun findByKeyId(keyId: String): User
 }

src/main/kotlin/dev/usbharu/hideout/query/UserQueryServiceImpl.kt

@@ -44,4 +44,10 @@ class UserQueryServiceImpl : UserQueryService {
 
     override suspend fun existByNameAndDomain(name: String, domain: String): Boolean =
         Users.select { Users.name eq name and (Users.domain eq domain) }.empty().not()
+
+    override suspend fun findByKeyId(keyId: String): User {
+        return Users.select { Users.keyId eq keyId }
+            .singleOr { FailedToGetResourcesException("keyId: $keyId  is duplicate or does not exist.", it) }
+            .toUser()
+    }
 }

src/main/kotlin/dev/usbharu/hideout/service/signature/HttpSignatureFilter.kt

@@ -1,12 +1,49 @@
 package dev.usbharu.hideout.service.signature
 
-import jakarta.servlet.Filter
-import jakarta.servlet.FilterChain
-import jakarta.servlet.ServletRequest
-import jakarta.servlet.ServletResponse
+import dev.usbharu.httpsignature.common.HttpHeaders
+import dev.usbharu.httpsignature.common.HttpMethod
+import dev.usbharu.httpsignature.common.HttpRequest
+import dev.usbharu.httpsignature.verify.SignatureHeaderParser
+import jakarta.servlet.http.HttpServletRequest
+import org.springframework.security.web.authentication.preauth.AbstractPreAuthenticatedProcessingFilter
+import java.net.URL
 
-class HttpSignatureFilter : Filter {
-    override fun doFilter(request: ServletRequest, response: ServletResponse, chain: FilterChain) {
-        chain.doFilter(request, response)
+class HttpSignatureFilter(private val httpSignatureHeaderParser: SignatureHeaderParser) :
+    AbstractPreAuthenticatedProcessingFilter() {
+    override fun getPreAuthenticatedPrincipal(request: HttpServletRequest?): Any {
+
+        val headersList = request?.headerNames?.toList().orEmpty()
+
+        val headers =
+            headersList.associateWith { header -> request?.getHeaders(header)?.toList().orEmpty() }
+
+
+        val signature = httpSignatureHeaderParser.parse(HttpHeaders(headers))
+        return signature.keyId
     }
+
+    override fun getPreAuthenticatedCredentials(request: HttpServletRequest?): Any {
+        requireNotNull(request)
+        val url = request.requestURL.toString()
+
+        val headersList = request.headerNames?.toList().orEmpty()
+
+        val headers =
+            headersList.associateWith { header -> request.getHeaders(header)?.toList().orEmpty() }
+
+        val method = when (val method = request.method.lowercase()) {
+            "get" -> HttpMethod.GET
+            "post" -> HttpMethod.POST
+            else -> {
+                throw IllegalArgumentException("Unsupported method: $method")
+            }
+        }
+
+        return HttpRequest(
+            URL(url + request.queryString),
+            HttpHeaders(headers),
+            method
+        )
+    }
+
 }

src/main/kotlin/dev/usbharu/hideout/service/signature/HttpSignatureUser.kt

@@ -0,0 +1,27 @@
+package dev.usbharu.hideout.service.signature
+
+import org.springframework.security.core.GrantedAuthority
+import org.springframework.security.core.userdetails.User
+import java.io.Serial
+
+class HttpSignatureUser(
+    username: String,
+    val domain: String,
+    credentialsNonExpired: Boolean,
+    accountNonLocked: Boolean,
+    authorities: MutableCollection<out GrantedAuthority>?
+) : User(
+    username,
+    "",
+    true,
+    true,
+    credentialsNonExpired,
+    accountNonLocked,
+    authorities
+) {
+    companion object {
+        @Serial
+        private const val serialVersionUID: Long = -3330552099960982997L
+    }
+
+}

src/main/kotlin/dev/usbharu/hideout/service/signature/HttpSignatureUserDetailsService.kt

@@ -0,0 +1,54 @@
+package dev.usbharu.hideout.service.signature
+
+import dev.usbharu.hideout.exception.FailedToGetResourcesException
+import dev.usbharu.hideout.exception.HttpSignatureVerifyException
+import dev.usbharu.hideout.query.UserQueryService
+import dev.usbharu.hideout.util.RsaUtil
+import dev.usbharu.httpsignature.common.HttpRequest
+import dev.usbharu.httpsignature.common.PublicKey
+import dev.usbharu.httpsignature.verify.FailedVerification
+import dev.usbharu.httpsignature.verify.HttpSignatureVerifier
+import kotlinx.coroutines.runBlocking
+import org.springframework.security.core.userdetails.AuthenticationUserDetailsService
+import org.springframework.security.core.userdetails.UserDetails
+import org.springframework.security.core.userdetails.UsernameNotFoundException
+import org.springframework.security.web.authentication.preauth.PreAuthenticatedAuthenticationToken
+
+class HttpSignatureUserDetailsService(
+    private val userQueryService: UserQueryService,
+    private val httpSignatureVerifier: HttpSignatureVerifier
+) :
+    AuthenticationUserDetailsService<PreAuthenticatedAuthenticationToken> {
+    override fun loadUserDetails(token: PreAuthenticatedAuthenticationToken): UserDetails = runBlocking {
+        if (token.principal !is String) {
+            throw IllegalStateException("Token is not String")
+        }
+        if (token.credentials !is HttpRequest) {
+            throw IllegalStateException("Credentials is not HttpRequest")
+        }
+
+        val keyId = token.principal as String
+        val findByKeyId = try {
+            userQueryService.findByKeyId(keyId)
+        } catch (e: FailedToGetResourcesException) {
+            throw UsernameNotFoundException("User not found", e)
+        }
+
+        val verify = httpSignatureVerifier.verify(
+            token.credentials as HttpRequest,
+            PublicKey(RsaUtil.decodeRsaPublicKeyPem(findByKeyId.publicKey), keyId)
+        )
+
+        if (verify is FailedVerification) {
+            throw HttpSignatureVerifyException(verify.reason)
+        }
+
+        HttpSignatureUser(
+            username = findByKeyId.name,
+            domain = findByKeyId.domain,
+            credentialsNonExpired = true,
+            accountNonLocked = true,
+            authorities = mutableListOf()
+        )
+    }
+}

src/main/kotlin/dev/usbharu/hideout/service/signature/HttpSignatureVerifierComposite.kt

@@ -0,0 +1,22 @@
+package dev.usbharu.hideout.service.signature
+
+import dev.usbharu.httpsignature.common.HttpRequest
+import dev.usbharu.httpsignature.common.PublicKey
+import dev.usbharu.httpsignature.verify.HttpSignatureVerifier
+import dev.usbharu.httpsignature.verify.SignatureHeaderParser
+import dev.usbharu.httpsignature.verify.VerificationResult
+
+class HttpSignatureVerifierComposite(
+    private val map: Map<String, HttpSignatureVerifier>,
+    private val httpSignatureHeaderParser: SignatureHeaderParser
+) : HttpSignatureVerifier {
+    override fun verify(httpRequest: HttpRequest, key: PublicKey): VerificationResult {
+        val signature = httpSignatureHeaderParser.parse(httpRequest.headers)
+        val verify = map[signature.algorithm]?.verify(httpRequest, key)
+        if (verify != null) {
+            return verify
+        }
+
+        throw IllegalArgumentException("Unsupported algorithm. ${signature.algorithm}")
+    }
+}