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server.go
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server.go
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package gold
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"os"
_path "path"
"path/filepath"
"strings"
"github.com/boltdb/bolt"
"github.com/gorilla/securecookie"
"golang.org/x/net/webdav"
"github.com/linkeddata/gold/pkg/apps"
// "github.com/linkeddata/gold/pkg/routes"
)
const (
// HCType is the header Content-Type
HCType = "Content-Type"
// SystemPrefix is the generic name for the system-reserved namespace (e.g. APIs)
SystemPrefix = ",account"
// LoginEndpoint is the link to the login page
LoginEndpoint = SystemPrefix + "/login"
// ProxyPath provides CORS proxy (empty to disable)
ProxyPath = ",proxy"
// QueryPath provides link-following support for twinql
QueryPath = ",query"
// AgentPath is the path to the agent's WebID profile
AgentPath = ",agent"
// RDFExtension is the default extension for RDF documents (i.e. turtle for now)
RDFExtension = ".ttl"
)
var (
// Streaming (stream data or not)
Streaming = false // experimental
debugFlags = log.Flags() | log.Lshortfile
debugPrefix = "[debug] "
methodsAll = []string{
"OPTIONS", "HEAD", "GET",
"PATCH", "POST", "PUT", "MKCOL", "DELETE",
"COPY", "MOVE", "LOCK", "UNLOCK",
}
)
type errorString struct {
s string
}
func (e *errorString) Error() string {
return e.s
}
// Server object contains http handler, root where the data is found and whether it uses vhosts or not
type Server struct {
http.Handler
Config *ServerConfig
cookie *securecookie.SecureCookie
cookieSalt []byte
debug *log.Logger
webdav *webdav.Handler
BoltDB *bolt.DB
}
type httpRequest struct {
*http.Request
*Server
AcceptType string
ContentType string
User string
IsOwner bool
}
func (req httpRequest) BaseURI() string {
scheme := "http"
if req.TLS != nil || req.Header.Get("X-Forwarded-Proto") == "https" {
scheme += "s"
}
reqHost := req.Host
if len(req.Header.Get("X-Forward-Host")) > 0 {
reqHost = req.Header.Get("X-Forward-Host")
}
host, port, err := net.SplitHostPort(reqHost)
if err != nil {
host = reqHost
}
if len(host) == 0 {
host = "localhost"
}
if len(port) > 0 {
port = ":" + port
}
if (scheme == "https" && port == ":443") || (scheme == "http" && port == ":80") {
port = ""
}
return scheme + "://" + host + port + req.URL.Path
}
func (req httpRequest) ifMatch(etag string) bool {
if len(etag) == 0 {
return true
}
if len(req.Header.Get("If-Match")) == 0 {
return true
}
val := strings.Split(req.Header.Get("If-Match"), ",")
for _, v := range val {
v = strings.TrimSpace(v)
if v == "*" || v == etag {
return true
}
}
return false
}
func (req httpRequest) ifNoneMatch(etag string) bool {
if len(etag) == 0 {
return true
}
if len(req.Header.Get("If-None-Match")) == 0 {
return true
}
val := strings.Split(req.Header.Get("If-None-Match"), ",")
for _, v := range val {
v = strings.TrimSpace(v)
if v != "*" && v != etag {
return true
}
}
return false
}
func handleStatusText(status int, err error) string {
switch status {
case 200:
return "HTTP 200 - OK"
case 401:
return Apps["401"]
case 403:
return Apps["403"]
case 404:
return "HTTP 404 - Not found\n\n" + err.Error()
case 500:
return "HTTP 500 - Internal Server Error\n\n" + err.Error()
default: // 501
return "HTTP 501 - Not implemented\n\n" + err.Error()
}
}
// NewServer is used to create a new Server instance
func NewServer(config *ServerConfig) *Server {
s := &Server{
Config: config,
cookie: securecookie.New(securecookie.GenerateRandomKey(32), securecookie.GenerateRandomKey(32)),
cookieSalt: securecookie.GenerateRandomKey(8),
webdav: &webdav.Handler{
FileSystem: webdav.Dir(config.DataRoot),
LockSystem: webdav.NewMemLS(),
},
}
AddRDFExtension(s.Config.ACLSuffix)
AddRDFExtension(s.Config.MetaSuffix)
if config.Debug {
s.debug = log.New(os.Stderr, debugPrefix, debugFlags)
} else {
s.debug = log.New(ioutil.Discard, "", 0)
}
s.debug.Println("---- starting server ----")
s.debug.Printf("config: %#v\n", s.Config)
return s
}
type response struct {
status int
headers http.Header
argv []interface{}
}
func (r *response) respond(status int, a ...interface{}) *response {
r.status = status
r.argv = a
return r
}
func (r *response) respondNotFound() *response {
page404, err := apps.NotFound()
if err != nil {
return r.respond(500, err)
}
return r.respond(404, page404)
}
// ServeHTTP handles the response
func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
// add HSTS
if s.Config.HSTS {
w.Header().Add("Strict-Transport-Security", "max-age=63072000; includeSubDomains")
}
origin := ""
origins := req.Header["Origin"] // all CORS requests
if len(origins) > 0 {
origin = origins[0]
w.Header().Set("Access-Control-Allow-Origin", origin)
}
if len(origin) < 1 {
w.Header().Set("Access-Control-Allow-Origin", "*")
}
if websocketUpgrade(req) {
websocketServe(w, req)
return
}
defer func() {
req.Body.Close()
}()
r := s.handle(w, &httpRequest{req, s, "", "", "", false})
for key := range r.headers {
w.Header().Set(key, r.headers.Get(key))
}
if r.status > 0 {
w.WriteHeader(r.status)
}
if len(r.argv) > 0 {
fmt.Fprint(w, r.argv...)
}
}
// Twinql Query
func TwinqlQuery(w http.ResponseWriter, req *httpRequest, s *Server) *response {
r := new(response)
err := ProxyReq(w, req, s, s.Config.QueryTemplate)
if err != nil {
s.debug.Println("Query error:", err.Error())
}
return r
}
// Proxy requests
func ProxyReq(w http.ResponseWriter, req *httpRequest, s *Server, reqUrl string) error {
uri, err := url.Parse(reqUrl)
if err != nil {
return err
}
host := uri.Host
if !s.Config.ProxyLocal {
if strings.HasPrefix(host, "10.") ||
strings.HasPrefix(host, "172.16.") ||
strings.HasPrefix(host, "192.168.") ||
strings.HasPrefix(host, "localhost") {
return errors.New("Proxying requests to the local network is not allowed.")
}
}
if len(req.FormValue("key")) > 0 {
token, err := decodeQuery(req.FormValue("key"))
if err != nil {
s.debug.Println(err.Error())
}
user, err := GetAuthzFromToken(token, req)
if err != nil {
s.debug.Println(err.Error())
} else {
s.debug.Println("Authorization valid for user", user)
}
req.User = user
}
if len(req.Header.Get("Authorization")) > 0 {
token, err := ParseBearerAuthorizationHeader(req.Header.Get("Authorization"))
if err != nil {
s.debug.Println(err.Error())
}
user, err := GetAuthzFromToken(token, req)
if err != nil {
s.debug.Println(err.Error())
} else {
s.debug.Println("Authorization valid for user", user)
}
req.User = user
}
req.URL = uri
req.Host = host
req.RequestURI = uri.RequestURI()
req.Header.Set("User", req.User)
proxy.ServeHTTP(w, req.Request)
return nil
}
func (s *Server) handle(w http.ResponseWriter, req *httpRequest) (r *response) {
r = new(response)
var err error
defer func() {
if rec := recover(); rec != nil {
s.debug.Println("\nRecovered from panic: ", rec)
}
}()
s.debug.Println("\n------ New " + req.Method + " request from " + req.RemoteAddr + " ------")
// CORS
w.Header().Set("Access-Control-Allow-Credentials", "true")
w.Header().Set("Access-Control-Expose-Headers", "User, Location, Link, Vary, Last-Modified, WWW-Authenticate, Content-Length, Content-Type, Accept-Patch, Accept-Post, Allow, Updates-Via, Ms-Author-Via")
w.Header().Set("Access-Control-Max-Age", "1728000")
// RWW
w.Header().Set("MS-Author-Via", "DAV, SPARQL")
w.Header().Set("Updates-Via", "wss://"+req.Host+"/")
// Get request key
rKey := req.Request.FormValue("key")
// Authentication
user := req.authn(w)
req.User = user
w.Header().Set("User", user)
acl := NewWAC(req, s, w, user, rKey)
// check if is owner
req.IsOwner = false
resource, _ := req.pathInfo(req.BaseURI())
if len(user) > 0 {
aclStatus, err := acl.AllowWrite(resource.Base)
if aclStatus == 200 && err == nil {
req.IsOwner = true
}
}
// Intercept API requests
if strings.Contains(req.Request.URL.Path, "/"+SystemPrefix) && req.Method != "OPTIONS" {
resp := HandleSystem(w, req, s)
if resp.Bytes != nil && len(resp.Bytes) > 0 {
// copy raw bytes
io.Copy(w, bytes.NewReader(resp.Bytes))
return
}
return r.respond(resp.Status, resp.Body)
}
// Proxy requests
if ProxyPath != "" && strings.HasSuffix(req.URL.Path, ProxyPath) {
err = ProxyReq(w, req, s, s.Config.ProxyTemplate+req.FormValue("uri"))
if err != nil {
s.debug.Println("Proxy error:", err.Error())
}
return
}
// Query requests
if req.Method == "POST" && QueryPath != "" &&
strings.Contains(req.URL.Path, QueryPath) &&
len(s.Config.QueryTemplate) > 0 {
return TwinqlQuery(w, req, s)
}
s.debug.Println(req.RemoteAddr + " requested resource URI: " + req.URL.String())
s.debug.Println(req.RemoteAddr + " requested resource Path: " + resource.File)
dataMime := req.Header.Get(HCType)
dataMime = strings.Split(dataMime, ";")[0]
dataHasParser := len(mimeParser[dataMime]) > 0
if len(dataMime) > 0 {
s.debug.Println("Content-Type: " + dataMime)
if dataMime != "multipart/form-data" && !dataHasParser && req.Method != "PUT" && req.Method != "HEAD" && req.Method != "OPTIONS" {
s.debug.Println("Request contains unsupported Media Type:" + dataMime)
return r.respond(415, "HTTP 415 - Unsupported Media Type:", dataMime)
}
req.ContentType = dataMime
}
// Content Negotiation
contentType := "text/turtle"
acceptList, _ := req.Accept()
if len(acceptList) > 0 && acceptList[0].SubType != "*" {
contentType, err = acceptList.Negotiate(serializerMimes...)
if err != nil {
s.debug.Println("Accept type not acceptable: " + err.Error())
return r.respond(406, "HTTP 406 - Accept type not acceptable: "+err.Error())
}
req.AcceptType = contentType
}
// set ACL Link header
w.Header().Set("Link", brack(resource.AclURI)+"; rel=\"acl\", "+brack(resource.MetaURI)+"; rel=\"meta\"")
// generic headers
w.Header().Set("Accept-Patch", "application/json, application/sparql-update")
w.Header().Set("Accept-Post", "text/turtle, application/json")
w.Header().Set("Allow", strings.Join(methodsAll, ", "))
w.Header().Set("Vary", "Origin")
switch req.Method {
case "OPTIONS":
// TODO: WAC
corsReqH := req.Header["Access-Control-Request-Headers"] // CORS preflight only
if len(corsReqH) > 0 {
w.Header().Set("Access-Control-Allow-Headers", strings.Join(corsReqH, ", "))
}
corsReqM := req.Header["Access-Control-Request-Method"] // CORS preflight only
if len(corsReqM) > 0 {
w.Header().Set("Access-Control-Allow-Methods", strings.Join(corsReqM, ", "))
} else {
w.Header().Set("Access-Control-Allow-Methods", strings.Join(methodsAll, ", "))
}
// set LDP Link headers
if resource.IsDir {
w.Header().Add("Link", brack("http://www.w3.org/ns/ldp#BasicContainer")+"; rel=\"type\"")
}
w.Header().Add("Link", brack("http://www.w3.org/ns/ldp#Resource")+"; rel=\"type\"")
// set API Link headers
w.Header().Add("Link", brack(resource.Base+"/"+SystemPrefix+"/login")+"; rel=\"http://www.w3.org/ns/solid/terms#loginEndpoint\"")
w.Header().Add("Link", brack(resource.Base+"/"+SystemPrefix+"/logout")+"; rel=\"http://www.w3.org/ns/solid/terms#logoutEndpoint\"")
w.Header().Add("Link", brack(resource.Base+"/,query")+"; rel=\"http://www.w3.org/ns/solid/terms#twinqlEndpoint\"")
w.Header().Add("Link", brack(resource.Base+"/,proxy?uri=")+"; rel=\"http://www.w3.org/ns/solid/terms#proxyEndpoint\"")
return r.respond(200)
case "GET", "HEAD":
unlock := lock(resource.File)
defer unlock()
var (
magicType = resource.FileType
maybeRDF bool
glob bool
globPath string
etag string
)
// check for glob
glob = false
if strings.Contains(resource.Obj.Path, "*") {
glob = true
path := filepath.Dir(resource.Obj.Path)
globPath = resource.File
if path == "." {
path = ""
} else {
path += "/"
}
resource, err = req.pathInfo(resource.Base + "/" + path)
if err != nil {
return r.respond(500, err)
}
}
if !resource.Exists {
return r.respondNotFound()
}
// First redirect to path + trailing slash if it's missing
if resource.IsDir && glob == false && !strings.HasSuffix(req.BaseURI(), "/") {
w.Header().Set(HCType, contentType)
urlStr := resource.URI
s.debug.Println("Redirecting to", urlStr)
http.Redirect(w, req.Request, urlStr, 301)
return
}
// overwrite ACL Link header
w.Header().Set("Link", brack(resource.AclURI)+"; rel=\"acl\", "+brack(resource.MetaURI)+"; rel=\"meta\"")
// redirect to app
if s.Config.Vhosts && !resource.Exists && resource.Base == strings.TrimRight(req.BaseURI(), "/") && contentType == "text/html" && req.Method != "HEAD" {
w.Header().Set(HCType, contentType)
urlStr := s.Config.SignUpApp + url.QueryEscape(resource.Obj.Scheme+"://"+resource.Obj.Host+"/"+SystemPrefix+"/accountStatus")
http.Redirect(w, req.Request, urlStr, 303)
return
}
if resource.IsDir {
w.Header().Add("Link", brack("http://www.w3.org/ns/ldp#BasicContainer")+"; rel=\"type\"")
}
w.Header().Add("Link", brack("http://www.w3.org/ns/ldp#Resource")+"; rel=\"type\"")
status := 501
aclStatus, err := acl.AllowRead(resource.URI)
if aclStatus > 200 || err != nil {
return r.respond(aclStatus, handleStatusText(aclStatus, err))
}
if req.Method == "HEAD" {
w.Header().Set("Content-Length", fmt.Sprintf("%d", resource.Size))
}
etag, err = NewETag(resource.File)
if err != nil {
return r.respond(500, err)
}
w.Header().Set("ETag", "\""+etag+"\"")
if !req.ifMatch("\"" + etag + "\"") {
return r.respond(412, "412 - Precondition Failed")
}
if !req.ifNoneMatch("\""+etag+"\"") && contentType != "text/html" {
// do not return cached views of dirs for html requests
return r.respond(304, "304 - Not Modified")
}
g := NewGraph(resource.URI)
if resource.IsDir {
if len(s.Config.DirIndex) > 0 && contentType == "text/html" {
magicType = "text/html"
maybeRDF = false
for _, dirIndex := range s.Config.DirIndex {
_, xerr := os.Stat(resource.File + dirIndex)
status = 200
if xerr == nil {
resource, err = req.pathInfo(resource.Base + "/" + resource.Path + dirIndex)
if err != nil {
return r.respond(500, err)
}
w.Header().Set("Link", brack(resource.MetaURI)+"; rel=\"meta\", "+brack(resource.AclURI)+"; rel=\"acl\"")
break
} else if req.Method != "HEAD" {
//TODO load file manager app from local preference file
w.Header().Set(HCType, contentType)
urlStr := s.Config.DirApp + resource.Obj.Scheme + "/" + resource.Obj.Host + "/" + resource.Obj.Path + "?" + req.Request.URL.RawQuery
s.debug.Println("Redirecting to", urlStr)
http.Redirect(w, req.Request, urlStr, 303)
return
}
}
} else {
w.Header().Add("Link", brack(resource.MetaURI)+"; rel=\"meta\"")
root := NewResource(resource.URI)
g.AddTriple(root, NewResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), NewResource("http://www.w3.org/ns/posix/stat#Directory"))
g.AddTriple(root, NewResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), NewResource("http://www.w3.org/ns/ldp#Container"))
g.AddTriple(root, NewResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), NewResource("http://www.w3.org/ns/ldp#BasicContainer"))
g.AddTriple(root, NewResource("http://www.w3.org/ns/posix/stat#mtime"), NewLiteral(fmt.Sprintf("%d", resource.ModTime.Unix())))
g.AddTriple(root, NewResource("http://www.w3.org/ns/posix/stat#size"), NewLiteral(fmt.Sprintf("%d", resource.Size)))
kb := NewGraph(resource.MetaURI)
kb.ReadFile(resource.MetaFile)
if kb.Len() > 0 {
for triple := range kb.IterTriples() {
var subject Term
if kb.One(NewResource(resource.MetaURI), nil, nil) != nil {
subject = NewResource(resource.URI)
} else {
subject = triple.Subject
}
g.AddTriple(subject, triple.Predicate, triple.Object)
}
}
if glob {
matches, err := filepath.Glob(globPath)
if err == nil {
for _, file := range matches {
res, err := req.pathInfo(resource.Base + "/" + filepath.Dir(resource.Path) + "/" + filepath.Base(file))
if !res.IsDir && res.Exists && err == nil {
aclStatus, err = acl.AllowRead(res.URI)
if aclStatus == 200 && err == nil {
g.AppendFile(res.File, res.URI)
g.AddTriple(root, NewResource("http://www.w3.org/ns/ldp#contains"), NewResource(res.URI))
}
}
}
}
} else {
showContainment := true
showEmpty := false
pref := ParsePreferHeader(req.Header.Get("Prefer"))
if len(pref.headers) > 0 {
w.Header().Set("Preference-Applied", "return=representation")
}
for _, include := range pref.Includes() {
switch include {
case "http://www.w3.org/ns/ldp#PreferContainment":
showContainment = true
case "http://www.w3.org/ns/ldp#PreferEmptyContainer":
showEmpty = true
}
}
for _, omit := range pref.Omits() {
switch omit {
case "http://www.w3.org/ns/ldp#PreferContainment":
showContainment = false
case "http://www.w3.org/ns/ldp#PreferEmptyContainer":
showEmpty = false
}
}
if infos, err := ioutil.ReadDir(resource.File); err == nil {
var _s Term
for _, info := range infos {
if info != nil {
// do not list ACLs and Meta files
if strings.HasSuffix(info.Name(), s.Config.ACLSuffix) || strings.HasSuffix(info.Name(), s.Config.MetaSuffix) {
continue
}
res := resource.URI + info.Name()
if info.IsDir() {
res += "/"
}
f, err := req.pathInfo(res)
if err != nil {
r.respond(500, err)
}
if info.IsDir() {
_s = NewResource(f.URI)
if !showEmpty {
g.AddTriple(_s, NewResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), NewResource("http://www.w3.org/ns/ldp#BasicContainer"))
g.AddTriple(_s, NewResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), NewResource("http://www.w3.org/ns/ldp#Container"))
}
kb := NewGraph(f.URI)
kb.ReadFile(f.MetaFile)
if kb.Len() > 0 {
for _, st := range kb.All(_s, NewResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), nil) {
if st != nil && st.Object != nil {
g.AddTriple(_s, NewResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), st.Object)
}
}
}
} else {
_s = NewResource(f.URI)
if !showEmpty {
g.AddTriple(_s, NewResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), NewResource("http://www.w3.org/ns/ldp#Resource"))
// add type if RDF resource
//infoUrl, _ := url.Parse(info.Name())
guessType := f.FileType
if guessType == "text/plain" {
// open file and attempt to read the first line
// Open an input file, exit on error.
fd, err := os.Open(f.File)
if err != nil {
s.debug.Println("GET find mime type error:" + err.Error())
}
defer fd.Close()
scanner := bufio.NewScanner(fd)
// stop after the first line
for scanner.Scan() {
if strings.HasPrefix(scanner.Text(), "@prefix") || strings.HasPrefix(scanner.Text(), "@base") {
kb := NewGraph(f.URI)
kb.ReadFile(f.File)
if kb.Len() > 0 {
for _, st := range kb.All(NewResource(f.URI), NewResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), nil) {
if st != nil && st.Object != nil {
g.AddTriple(_s, NewResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), st.Object)
}
}
}
}
break
}
// log potential errors
if err := scanner.Err(); err != nil {
s.debug.Println("GET scan err: " + scanner.Err().Error())
}
}
}
}
if !showEmpty {
g.AddTriple(_s, NewResource("http://www.w3.org/ns/posix/stat#mtime"), NewLiteral(fmt.Sprintf("%d", info.ModTime().Unix())))
g.AddTriple(_s, NewResource("http://www.w3.org/ns/posix/stat#size"), NewLiteral(fmt.Sprintf("%d", info.Size())))
}
if showContainment {
g.AddTriple(root, NewResource("http://www.w3.org/ns/ldp#contains"), _s)
}
}
}
}
}
status = 200
maybeRDF = true
}
} else {
magicType = resource.FileType
maybeRDF = resource.MaybeRDF
if len(mimeRdfExt[resource.Extension]) > 0 {
maybeRDF = true
}
if !maybeRDF && magicType == "text/plain" {
maybeRDF = true
}
s.debug.Println("Setting CType to:", magicType)
status = 200
if req.Method == "GET" && strings.Contains(contentType, "text/html") {
// delete ETag to force load the app
w.Header().Del("ETag")
w.Header().Set("Link", brack(resource.MetaURI)+"; rel=\"meta\", "+brack(resource.AclURI)+"; rel=\"acl\"")
if maybeRDF {
w.Header().Set(HCType, contentType)
s.debug.Println("Rendering data app")
app, err := apps.DataApp()
if err != nil {
return r.respond(500, "")
}
return r.respond(200, app)
}
w.Header().Set(HCType, magicType)
w.WriteHeader(200)
f, err := os.Open(resource.File)
if err == nil {
defer func() {
if err := f.Close(); err != nil {
s.debug.Println("GET os.Open err: " + err.Error())
}
}()
io.Copy(w, f)
}
return
}
}
if status != 200 {
return r.respond(status)
}
if req.Method == "HEAD" {
w.Header().Set(HCType, contentType)
return r.respond(status)
}
if !maybeRDF && len(magicType) > 0 {
w.Header().Set(HCType, magicType)
if status == 200 {
f, err := os.Open(resource.File)
if err == nil {
defer func() {
if err := f.Close(); err != nil {
s.debug.Println("GET f.Close err:" + err.Error())
}
}()
io.Copy(w, f)
}
} else {
w.WriteHeader(status)
}
return
}
if maybeRDF {
g.ReadFile(resource.File)
w.Header().Set(HCType, contentType)
}
data := ""
if Streaming {
errCh := make(chan error, 8)
go func() {
rf, wf, err := os.Pipe()
if err != nil {
errCh <- err
return
}
go func() {
defer wf.Close()
err := g.WriteFile(wf, contentType)
if err != nil {
errCh <- err
}
}()
go func() {
defer rf.Close()
_, err := io.Copy(w, rf)
if err != nil {
errCh <- err
} else {
errCh <- nil
}
}()
}()
err = <-errCh
} else {
data, err = g.Serialize(contentType)
}
if err != nil {
return r.respond(500, err)
} else if len(data) > 0 {
fmt.Fprint(w, data)
}
return
case "PATCH":
unlock := lock(resource.File)
defer unlock()
// check append first
aclAppend, err := acl.AllowAppend(resource.URI)
if aclAppend > 200 || err != nil {
// check if we can write then
aclWrite, err := acl.AllowWrite(resource.URI)
if aclWrite > 200 || err != nil {
return r.respond(aclWrite, handleStatusText(aclWrite, err))
}
}
etag, _ := NewETag(resource.File)
if !req.ifMatch("\"" + etag + "\"") {
return r.respond(412, "412 - Precondition Failed")
}
if !req.ifNoneMatch("\"" + etag + "\"") {
return r.respond(412, "412 - Precondition Failed")
}
if dataHasParser {
s.debug.Println("Preparing to PATCH resource", resource.URI, "with file", resource.File)
buf, _ := ioutil.ReadAll(req.Body)
body := ioutil.NopCloser(bytes.NewBuffer(buf))
req.Body.Close()
if req.Header.Get("Content-Length") == "0" || len(buf) == 0 {
errmsg := "Could not patch resource. No SPARQL statements found in the request."
s.debug.Println(errmsg)
return r.respond(400, errmsg)
}
g := NewGraph(resource.URI)
g.ReadFile(resource.File)
switch dataMime {
case "application/json":
g.JSONPatch(body)
case "application/sparql-update":
sparql := NewSPARQLUpdate(g.URI())
sparql.Parse(body)
ecode, err := g.SPARQLUpdate(sparql)
if err != nil {
return r.respond(ecode, "Error processing SPARQL Update: "+err.Error())
}
default:
if dataHasParser {
g.Parse(body, dataMime)
}
}
if !resource.Exists {
err = os.MkdirAll(_path.Dir(resource.File), 0755)
if err != nil {
s.debug.Println("PATCH MkdirAll err: " + err.Error())
return r.respond(500, err)
}
}
f, err := os.OpenFile(resource.File, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0664)
if err != nil {
s.debug.Println("PATCH os.OpenFile err: " + err.Error())
return r.respond(500, err)
}
defer f.Close()
err = g.WriteFile(f, "text/turtle")
if err != nil {
s.debug.Println("PATCH g.WriteFile err: " + err.Error())
return r.respond(500, err)
}
s.debug.Println("Succefully PATCHed resource", resource.URI)
onUpdateURI(resource.URI)
onUpdateURI(resource.ParentURI)
return r.respond(200)
}
case "POST":
unlock := lock(resource.File)
defer unlock()
updateURI := resource.URI
// check append first
aclAppend, err := acl.AllowAppend(resource.URI)
if aclAppend > 200 || err != nil {
// check if we can write then
aclWrite, err := acl.AllowWrite(resource.URI)
if aclWrite > 200 || err != nil {
return r.respond(aclWrite, handleStatusText(aclWrite, err))
}
}
err = nil
etag, _ := NewETag(resource.File)
if !req.ifMatch("\"" + etag + "\"") {
return r.respond(412, "412 - Precondition Failed")
}
if !req.ifNoneMatch("\"" + etag + "\"") {
return r.respond(412, "412 - Precondition Failed")
}
// LDP
isNew := false
if resource.IsDir && dataMime != "multipart/form-data" {
link := ParseLinkHeader(req.Header.Get("Link")).MatchRel("type")
slug := req.Header.Get("Slug")
uuid := NewUUID()
uuid = uuid[:6]
if !strings.HasSuffix(resource.Path, "/") {
resource.Path += "/"
}
if len(slug) > 0 {
if strings.HasPrefix(slug, "/") {
slug = strings.TrimLeft(slug, "/")
}
if strings.HasSuffix(slug, "/") {
slug = strings.TrimRight(slug, "/")
}
st, err := os.Stat(resource.File + slug)
//@@TODO append a random string
if st != nil && !os.IsNotExist(err) {
slug += "-" + uuid
}
} else {
slug = uuid
}
resource.Path += slug
if len(link) > 0 && link == "http://www.w3.org/ns/ldp#BasicContainer" {
if !strings.HasSuffix(resource.Path, "/") {
resource.Path += "/"
}
resource, err = req.pathInfo(resource.Base + "/" + resource.Path)
if err != nil {
s.debug.Println("POST LDPC req.pathInfo err: " + err.Error())
return r.respond(500, err)
}
w.Header().Set("Location", resource.URI)
w.Header().Set("Link", brack(resource.MetaURI)+"; rel=\"meta\", "+brack(resource.AclURI)+"; rel=\"acl\"")
w.Header().Add("Link", brack("http://www.w3.org/ns/ldp#Resource")+"; rel=\"type\"")
w.Header().Add("Link", brack("http://www.w3.org/ns/ldp#BasicContainer")+"; rel=\"type\"")
err = os.MkdirAll(resource.File, 0755)
if err != nil {
s.debug.Println("POST LDPC os.MkdirAll err: " + err.Error())
return r.respond(500, err)
}
s.debug.Println("Created dir " + resource.File)
buf := new(bytes.Buffer)
buf.ReadFrom(req.Body)
if buf.Len() > 0 {
f, err := os.OpenFile(resource.MetaFile, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
if err != nil {
s.debug.Println("POST LDPC os.OpenFile err: " + err.Error())
return r.respond(500, err)
}
defer f.Close()
_, err = io.Copy(f, buf)
if err != nil {
s.debug.Println("POST io.Copy err: " + err.Error())
}
}
w.Header().Set("Location", resource.URI)
onUpdateURI(resource.URI)
onUpdateURI(resource.ParentURI)
return r.respond(201)
}
resource, err = req.pathInfo(resource.Base + "/" + resource.Path)
if err != nil {
s.debug.Println("POST LDPR req.pathInfo err: " + err.Error())
return r.respond(500, err)
}
w.Header().Set("Location", resource.URI)
w.Header().Set("Link", brack(resource.MetaURI)+"; rel=\"meta\", "+brack(resource.AclURI)+"; rel=\"acl\"")
// LDP header
w.Header().Add("Link", brack("http://www.w3.org/ns/ldp#Resource")+"; rel=\"type\"")
isNew = true
}
if !resource.Exists {
err = os.MkdirAll(_path.Dir(resource.File), 0755)
if err != nil {
s.debug.Println("POST MkdirAll err: " + err.Error())
return r.respond(500, err)
}
s.debug.Println("Created resource " + _path.Dir(resource.File))