Merge 0d526ea into 9a1f324

config/ldp/metadata-parser/default.json

@@ -2,6 +2,7 @@
   "@context": "https://linkedsoftwaredependencies.org/bundles/npm/@solid/community-server/^2.0.0/components/context.jsonld",
   "import": [
     "files-scs:config/ldp/metadata-parser/parsers/content-type.json",
+    "files-scs:config/ldp/metadata-parser/parsers/content-length.json",
     "files-scs:config/ldp/metadata-parser/parsers/slug.json",
     "files-scs:config/ldp/metadata-parser/parsers/link.json"
   ],
@@ -12,6 +13,7 @@
       "@type": "ParallelHandler",
       "handlers": [
         { "@id": "urn:solid-server:default:ContentTypeParser" },
+        { "@id": "urn:solid-server:default:ContentLengthParser" },
         { "@id": "urn:solid-server:default:SlugParser" },
         { "@id": "urn:solid-server:default:LinkRelParser" }
       ]

config/ldp/metadata-parser/parsers/content-length.json

@@ -0,0 +1,10 @@
+{
+  "@context": "https://linkedsoftwaredependencies.org/bundles/npm/@solid/community-server/^2.0.0/components/context.jsonld",
+  "@graph": [
+    {
+      "comment": "Converts content-length headers into RDF metadata.",
+      "@id": "urn:solid-server:default:ContentLengthParser",
+      "@type": "ContentLengthParser"
+    }
+  ]
+}

config/quota-file.json

@@ -0,0 +1,50 @@
+{
+  "@context": "https://linkedsoftwaredependencies.org/bundles/npm/@solid/community-server/^2.0.0/components/context.jsonld",
+  "import": [
+    "files-scs:config/app/main/default.json",
+    "files-scs:config/app/init/default.json",
+    "files-scs:config/app/setup/required.json",
+    "files-scs:config/http/handler/default.json",
+    "files-scs:config/http/middleware/websockets.json",
+    "files-scs:config/http/server-factory/websockets.json",
+    "files-scs:config/http/static/default.json",
+    "files-scs:config/identity/access/public.json",
+    "files-scs:config/identity/email/default.json",
+    "files-scs:config/identity/handler/default.json",
+    "files-scs:config/identity/ownership/token.json",
+    "files-scs:config/identity/pod/static.json",
+    "files-scs:config/identity/registration/enabled.json",
+    "files-scs:config/ldp/authentication/dpop-bearer.json",
+    "files-scs:config/ldp/authorization/allow-all.json",
+    "files-scs:config/ldp/handler/default.json",
+    "files-scs:config/ldp/metadata-parser/default.json",
+    "files-scs:config/ldp/metadata-writer/default.json",
+    "files-scs:config/ldp/modes/default.json",
+    "files-scs:config/storage/backend/pod-quota-file.json",
+    "files-scs:config/storage/key-value/resource-store.json",
+    "files-scs:config/storage/middleware/default.json",
+    "files-scs:config/util/auxiliary/acl.json",
+    "files-scs:config/util/identifiers/suffix.json",
+    "files-scs:config/util/index/default.json",
+    "files-scs:config/util/logging/winston.json",
+    "files-scs:config/util/representation-conversion/default.json",
+    "files-scs:config/util/resource-locker/memory.json",
+    "files-scs:config/util/variables/default.json"
+  ],
+  "@graph": [
+    {
+      "comment": "A single-pod server that stores its resources on disk while enforcing quota."
+    },
+    {
+      "@id": "urn:solid-server:default:QuotaStrategy",
+      "PodQuotaStrategy:_limit_amount": 7000,
+      "PodQuotaStrategy:_limit_unit": "bytes",
+      "GlobalQuotaStrategy:_limit_amount": 10000,
+      "GlobalQuotaStrategy:_limit_unit": "bytes"
+    },
+    {
+      "@id": "urn:solid-server:default:SizeReporter",
+      "FileSizeReporter:_ignoreFolders": [ "^/\\.internal$" ]
+    }
+  ]
+}

config/storage/backend/data-accessors/global-quota-file.json

@@ -0,0 +1,45 @@
+{
+  "@context": "https://linkedsoftwaredependencies.org/bundles/npm/@solid/community-server/^2.0.0/components/context.jsonld",
+  "comment": "DataAccessor configuration using a GlobalQuotaStrategy to enforce quota globally on the server",
+  "@graph": [
+    {
+      "comment": "DataAccessor that writes data to the disk with atomicity in mind",
+      "@id": "urn:solid-server:default:AtomicFileDataAccessor",
+      "@type": "AtomicFileDataAccessor",
+      "resourceMapper": { "@id": "urn:solid-server:default:FileIdentifierMapper" },
+      "rootFilePath": { "@id": "urn:solid-server:default:variable:rootFilePath" },
+      "tempFilePath": "/.internal/tempFiles/"
+    },
+
+    {
+      "comment": "Calculates the space already taken up by a resource",
+      "@id": "urn:solid-server:default:SizeReporter",
+      "@type": "FileSizeReporter",
+      "fileIdentifierMapper": { "@id": "urn:solid-server:default:FileIdentifierMapper" },
+      "rootFilePath": { "@id": "urn:solid-server:default:variable:rootFilePath" },
+    },
+
+    {
+      "comment": "Enforces quota globally for all data on the server",
+      "@id": "urn:solid-server:default:QuotaStrategy",
+      "@type": "GlobalQuotaStrategy",
+      "reporter": { "@id": "urn:solid-server:default:SizeReporter" },
+      "base": { "@id": "urn:solid-server:default:variable:baseUrl" }
+    },
+
+    {
+      "comment": "Validates the data being written to the server",
+      "@id": "urn:solid-server:default:QuotaValidator",
+      "@type": "QuotaValidator",
+      "strategy": { "@id": "urn:solid-server:default:QuotaStrategy" }
+    },
+
+    {
+      "comment": "Simple wrapper for another DataAccessor but adds validation",
+      "@id": "urn:solid-server:default:FileDataAccessor",
+      "@type": "ValidatingDataAccessor",
+      "accessor": { "@id": "urn:solid-server:default:AtomicFileDataAccessor" },
+      "validator": { "@id": "urn:solid-server:default:QuotaValidator" }
+    }
+  ]
+}

config/storage/backend/data-accessors/pod-quota-file.json

@@ -0,0 +1,46 @@
+{
+  "@context": "https://linkedsoftwaredependencies.org/bundles/npm/@solid/community-server/^2.0.0/components/context.jsonld",
+  "comment": "DataAccessor configuration using a PodQuotaStrategy to enforce pod quotas on the server",
+  "@graph": [
+    {
+      "comment": "DataAccessor that writes data to the disk with atomicity in mind",
+      "@id": "urn:solid-server:default:AtomicFileDataAccessor",
+      "@type": "AtomicFileDataAccessor",
+      "resourceMapper": { "@id": "urn:solid-server:default:FileIdentifierMapper" },
+      "rootFilePath": { "@id": "urn:solid-server:default:variable:rootFilePath" },
+      "tempFilePath": "/.internal/tempFiles/"
+    },
+
+    {
+      "comment": "Calculates the space already taken up by a resource",
+      "@id": "urn:solid-server:default:SizeReporter",
+      "@type": "FileSizeReporter",
+      "fileIdentifierMapper": { "@id": "urn:solid-server:default:FileIdentifierMapper" },
+      "rootFilePath": { "@id": "urn:solid-server:default:variable:rootFilePath" },
+    },
+
+    {
+      "comment": "Enforces quota for all data per pod on the server",
+      "@id": "urn:solid-server:default:QuotaStrategy",
+      "@type": "PodQuotaStrategy",
+      "reporter": { "@id": "urn:solid-server:default:SizeReporter" },
+      "accessor": { "@id": "urn:solid-server:default:AtomicFileDataAccessor" },
+      "identifierStrategy": { "@id": "urn:solid-server:default:IdentifierStrategy" }
+    },
+
+    {
+      "comment": "Validates the data being written to the server",
+      "@id": "urn:solid-server:default:QuotaValidator",
+      "@type": "QuotaValidator",
+      "strategy": { "@id": "urn:solid-server:default:QuotaStrategy" }
+    },
+
+    {
+      "comment": "Simple wrapper for another DataAccessor but adds validation",
+      "@id": "urn:solid-server:default:FileDataAccessor",
+      "@type": "ValidatingDataAccessor",
+      "accessor": { "@id": "urn:solid-server:default:AtomicFileDataAccessor" },
+      "validator": { "@id": "urn:solid-server:default:QuotaValidator" }
+    }
+  ]
+}

config/storage/backend/global-quota-file.json

@@ -0,0 +1,16 @@
+{
+  "@context": "https://linkedsoftwaredependencies.org/bundles/npm/@solid/community-server/^2.0.0/components/context.jsonld",
+  "import": [
+    "files-scs:config/storage/backend/data-accessors/global-quota-file.json"
+  ],
+  "@graph": [
+    {
+      "comment": "A default store setup with a file system backend.",
+      "@id": "urn:solid-server:default:ResourceStore_Backend",
+      "@type": "DataAccessorBasedStore",
+      "identifierStrategy": { "@id": "urn:solid-server:default:IdentifierStrategy" },
+      "auxiliaryStrategy": { "@id": "urn:solid-server:default:AuxiliaryStrategy" },
+      "accessor": { "@id": "urn:solid-server:default:FileDataAccessor" }
+    }
+  ]
+}

config/storage/backend/pod-quota-file.json

@@ -0,0 +1,16 @@
+{
+  "@context": "https://linkedsoftwaredependencies.org/bundles/npm/@solid/community-server/^2.0.0/components/context.jsonld",
+  "import": [
+    "files-scs:config/storage/backend/data-accessors/pod-quota-file.json"
+  ],
+  "@graph": [
+    {
+      "comment": "A default store setup with a file system backend.",
+      "@id": "urn:solid-server:default:ResourceStore_Backend",
+      "@type": "DataAccessorBasedStore",
+      "identifierStrategy": { "@id": "urn:solid-server:default:IdentifierStrategy" },
+      "auxiliaryStrategy": { "@id": "urn:solid-server:default:AuxiliaryStrategy" },
+      "accessor": { "@id": "urn:solid-server:default:FileDataAccessor" }
+    }
+  ]
+}

package.json

@@ -53,6 +53,7 @@
     "prepare": "npm run build",
     "start": "node ./bin/server.js",
     "start:file": "node ./bin/server.js -c config/file.json -f ./data",
+    "start:file:quota": "node ./bin/server.js -c config/quota-file.json -f ./data",
     "test": "npm run test:ts && npm run jest",
     "test:deploy": "test/deploy/validate-package.sh",
     "test:ts": "tsc -p test --noEmit",

src/http/auxiliary/ComposedAuxiliaryStrategy.ts

@@ -58,7 +58,10 @@ export class ComposedAuxiliaryStrategy implements AuxiliaryStrategy {
 
   public async validate(representation: Representation): Promise<void> {
     if (this.validator) {
-      return this.validator.handleSafe(representation);
+      await this.validator.handleSafe({
+        representation,
+        identifier: { path: representation.metadata.identifier.value },
+      });
     }
   }
 }

src/http/auxiliary/RdfValidator.ts

@@ -3,6 +3,7 @@ import type { RepresentationConverter } from '../../storage/conversion/Represent
 import { INTERNAL_QUADS } from '../../util/ContentTypes';
 import { cloneRepresentation } from '../../util/ResourceUtil';
 import type { Representation } from '../representation/Representation';
+import type { ValidatorInput } from './Validator';
 import { Validator } from './Validator';
 
 /**
@@ -17,12 +18,11 @@ export class RdfValidator extends Validator {
     this.converter = converter;
   }
 
-  public async handle(representation: Representation): Promise<void> {
+  public async handle({ representation, identifier }: ValidatorInput): Promise<Representation> {
     // If the data already is quads format we know it's RDF
     if (representation.metadata.contentType === INTERNAL_QUADS) {
-      return;
+      return representation;
     }
-    const identifier = { path: representation.metadata.identifier.value };
     const preferences = { type: { [INTERNAL_QUADS]: 1 }};
     let result;
     try {
@@ -39,5 +39,7 @@ export class RdfValidator extends Validator {
     }
     // Drain stream to make sure data was parsed correctly
     await arrayifyStream(result.data);
+
+    return representation;
   }
 }

src/http/auxiliary/Validator.ts

@@ -1,7 +1,13 @@
 import { AsyncHandler } from '../../util/handlers/AsyncHandler';
 import type { Representation } from '../representation/Representation';
+import type { ResourceIdentifier } from '../representation/ResourceIdentifier';
+
+export type ValidatorInput = {
+  representation: Representation;
+  identifier: ResourceIdentifier;
+};
 
 /**
  * Generic interface for classes that validate Representations in some way.
  */
-export abstract class Validator extends AsyncHandler<Representation> { }
+export abstract class Validator extends AsyncHandler<ValidatorInput, Representation> { }

src/http/input/metadata/ContentLengthParser.ts

@@ -0,0 +1,23 @@
+import { getLoggerFor } from '../../../logging/LogUtil';
+import type { HttpRequest } from '../../../server/HttpRequest';
+import type { RepresentationMetadata } from '../../representation/RepresentationMetadata';
+import { MetadataParser } from './MetadataParser';
+
+/**
+ * Parser for the `content-length` header.
+ */
+export class ContentLengthParser extends MetadataParser {
+  protected readonly logger = getLoggerFor(this);
+
+  public async handle(input: { request: HttpRequest; metadata: RepresentationMetadata }): Promise<void> {
+    const contentLength = input.request.headers['content-length'];
+    if (contentLength) {
+      const length = /^\s*(\d+)\s*(?:;.*)?$/u.exec(contentLength)?.[1];
+      if (length) {
+        input.metadata.contentLength = Number(length);
+      } else {
+        this.logger.warn(`Invalid content-length header found: ${contentLength}.`);
+      }
+    }
+  }
+}

src/http/representation/RepresentationMetadata.ts

@@ -2,8 +2,8 @@ import { DataFactory, Store } from 'n3';
 import type { BlankNode, DefaultGraph, Literal, NamedNode, Quad, Term } from 'rdf-js';
 import { getLoggerFor } from '../../logging/LogUtil';
 import { InternalServerError } from '../../util/errors/InternalServerError';
-import { toNamedTerm, toObjectTerm, toCachedNamedNode, isTerm } from '../../util/TermUtil';
-import { CONTENT_TYPE, CONTENT_TYPE_TERM } from '../../util/Vocabularies';
+import { toNamedTerm, toObjectTerm, toCachedNamedNode, isTerm, toLiteral } from '../../util/TermUtil';
+import { CONTENT_TYPE, CONTENT_TYPE_TERM, CONTENT_LENGTH_TERM, XSD } from '../../util/Vocabularies';
 import type { ResourceIdentifier } from './ResourceIdentifier';
 import { isResourceIdentifier } from './ResourceIdentifier';
 
@@ -316,4 +316,18 @@ export class RepresentationMetadata {
   public set contentType(input) {
     this.set(CONTENT_TYPE_TERM, input);
   }
+
+  /**
+  * Shorthand for the CONTENT_LENGTH predicate.
+  */
+  public get contentLength(): number | undefined {
+    const length = this.get(CONTENT_LENGTH_TERM);
+    return length?.value ? Number(length.value) : undefined;
+  }
+
+  public set contentLength(input) {
+    if (input) {
+      this.set(CONTENT_LENGTH_TERM, toLiteral(input, XSD.terms.integer));
+    }
+  }
 }

src/index.ts

@@ -21,10 +21,10 @@ export * from './authorization/permissions/MethodModesExtractor';
 export * from './authorization/permissions/SparqlPatchModesExtractor';
 
 // Authorization
-export * from './authorization/OwnerPermissionReader';
 export * from './authorization/AllStaticReader';
 export * from './authorization/Authorizer';
 export * from './authorization/AuxiliaryReader';
+export * from './authorization/OwnerPermissionReader';
 export * from './authorization/PathBasedReader';
 export * from './authorization/PermissionBasedAuthorizer';
 export * from './authorization/PermissionReader';
@@ -57,6 +57,7 @@ export * from './http/input/identifier/OriginalUrlExtractor';
 export * from './http/input/identifier/TargetExtractor';
 
 // HTTP/Input/Metadata
+export * from './http/input/metadata/ContentLengthParser';
 export * from './http/input/metadata/ContentTypeParser';
 export * from './http/input/metadata/LinkRelParser';
 export * from './http/input/metadata/MetadataParser';
@@ -248,10 +249,14 @@ export * from './server/util/RedirectAllHttpHandler';
 export * from './server/util/RouterHandler';
 
 // Storage/Accessors
+export * from './storage/accessors/AtomicDataAccessor';
+export * from './storage/accessors/AtomicFileDataAccessor';
 export * from './storage/accessors/DataAccessor';
 export * from './storage/accessors/FileDataAccessor';
 export * from './storage/accessors/InMemoryDataAccessor';
+export * from './storage/accessors/PassthroughDataAccessor';
 export * from './storage/accessors/SparqlDataAccessor';
+export * from './storage/accessors/ValidatingDataAccessor';
 
 // Storage/Conversion
 export * from './storage/conversion/BaseTypedRepresentationConverter';
@@ -295,13 +300,26 @@ export * from './storage/patch/RepresentationPatcher';
 export * from './storage/patch/RepresentationPatchHandler';
 export * from './storage/patch/SparqlUpdatePatcher';
 
+// Storage/Quota
+export * from './storage/quota/GlobalQuotaStrategy';
+export * from './storage/quota/PodQuotaStrategy';
+export * from './storage/quota/QuotaStrategy';
+
 // Storage/Routing
 export * from './storage/routing/BaseUrlRouterRule';
 export * from './storage/routing/ConvertingRouterRule';
 export * from './storage/routing/PreferenceSupport';
 export * from './storage/routing/RegexRouterRule';
 export * from './storage/routing/RouterRule';
 
+// Storage/Size-Reporter
+export * from './storage/size-reporter/FileSizeReporter';
+export * from './storage/size-reporter/Size';
+export * from './storage/size-reporter/SizeReporter';
+
+// Storage/Validators
+export * from './storage/validators/QuotaValidator';
+
 // Storage
 export * from './storage/AtomicResourceStore';
 export * from './storage/BaseResourceStore';

src/storage/accessors/AtomicDataAccessor.ts

@@ -0,0 +1,10 @@
+import type { DataAccessor } from './DataAccessor';
+
+/**
+ * The AtomicDataAccessor interface has identical function signatures as
+ * the DataAccessor, with the additional constraint that every function call
+ * must be atomic in its effect: either the call fully succeeds, reaching the
+ * desired new state; or it fails, upon which the resulting state remains
+ * identical to the one before the call.
+ */
+export interface AtomicDataAccessor extends DataAccessor { }