func ContextualizeRecordChangesGET(ctx context.Context, db data.DB, logger services.Logger) websocket.Handler {
return func(ws *websocket.Conn) {
defer ws.Close()
l := logger.WithPrefix("ContextualizeRecordChangesGET: ")
if err := ws.Request().ParseForm(); err != nil {
l.Printf("error parsing form: %s", err)
return
}
public := ws.Request().Form.Get(publicParam)
private := ws.Request().Form.Get(privateParam)
if public == "" || private == "" {
l.Print("failed to retrieve credentials")
return
}
cred, err := access.Authenticate(db, public, private)
if err != nil {
l.Print("failed to authenticate")
return
}
if u, err := cred.Owner(db); err != nil {
l.Print("error retrieving user: %s", err)
} else {
RecordChangesGET(user.NewContext(ctx, u), ws, db, logger)
}
}
}
func IndexGET(ctx context.Context, w http.ResponseWriter, r *http.Request, db data.DB, logger services.Logger) {
l := logger.WithPrefix("IndexGet: ")
u, _ := user.FromContext(ctx)
// u may be nil
if err := indexTemplate.Execute(w, u); err != nil {
l.Fatal(err)
}
}
// Expects: From, To, Body params
func CommandSMSPOST(ctx context.Context, w http.ResponseWriter, r *http.Request, logger services.Logger, sessions services.SMSCommandSessions) {
m, err := sms.ExtractMessageFromRequest(r)
if err != nil {
logger.Fatal(err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
sessions.Inbound(m)
w.WriteHeader(http.StatusNoContent)
}
// Expects: the context to hold the authed user
func CommandWebGET(ctx context.Context, ws *websocket.Conn, logger services.Logger, db data.DB) {
u, ok := user.FromContext(ctx)
if !ok {
logger.Print("CommandWebGET Error: failed to retrieve user from context")
return
}
input := make(chan string)
output := make(chan string)
session := command.NewSession(
u, db, input, output,
func() {
log.Print("CommandWebGET bail")
close(output)
},
)
go session.Start()
go func() {
for {
var message string
err := websocket.Message.Receive(ws, &message)
if err != nil {
if err != io.EOF {
log.Printf("Read fail: %s", err)
}
close(output) // should this know about output
return
}
input <- message
}
}()
for o := range output {
err := websocket.Message.Send(ws, o)
if err != nil {
log.Printf("Write fail: %s", err)
return
}
}
}
func ContextualizeCommandWebGET(ctx context.Context, db data.DB, logger services.Logger) websocket.Handler {
return func(c *websocket.Conn) {
if err := c.Request().ParseForm(); err != nil {
logger.Print("Failure parsing form")
return
}
public := c.Request().Form.Get("public")
private := c.Request().Form.Get("private")
if public == "" || private == "" {
logger.Print("failed to retrieve credentials")
return
}
cred, err := access.Authenticate(db, public, private)
if err != nil {
logger.Print("failed to auth")
return
}
u, _ := cred.Owner(db)
CommandWebGET(user.NewContext(ctx, u), c, logger, db)
}
}
// basic logging
func logRequest(handle http.HandlerFunc, logger services.Logger) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
logger.Printf("%s %s", r.Method, r.URL)
handle(w, r)
}
}
// EventPOST implements gaia's response to a POST request to the '/event/' endpoint.
//
// Assumptions: The user has been authenticated.
//
// Proceedings: Parses the url parameters.
func EventPOST(ctx context.Context, w http.ResponseWriter, r *http.Request, db data.DB, logger services.Logger) {
l := logger.WithPrefix("EventPOST: ")
// Parse the form
if err := r.ParseForm(); err != nil {
l.Printf("error parsing form: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// Retrieve the tags parameter
tagNames, ok := r.Form[tagsParam]
if !ok {
l.Print("no tags param")
tagNames = []string{}
}
// if any tag names have commas, split those
tagNames = flatten(mapSplit(tagNames, ","))
// Retrieve our user
u, ok := user.FromContext(ctx)
if !ok {
l.Print("failed to retrieve user from context")
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
e := new(models.Event)
tags := make([]*models.Tag, len(tagNames))
for i, n := range tagNames {
t, err := tag.ForName(db, u, tag.Name(n))
if err != nil {
l.Printf("tag.ForName(%q) error: %s", n, err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
tags[i] = t
}
defer r.Body.Close()
if requestBody, err := ioutil.ReadAll(r.Body); err != nil {
l.Printf("ioutil.ReadAll(r.Body) error: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
} else if err := json.Unmarshal(requestBody, e); err != nil {
l.Printf("info: request body:\n%s", string(requestBody))
l.Printf("error: while unmarshalling request body, %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
if e.CreatedAt.IsZero() {
e.CreatedAt = time.Now()
}
e.UpdatedAt = time.Now()
e.SetOwner(u)
for _, t := range tags {
e.IncludeTag(t)
}
if allowed, err := access.CanCreate(db, u, e); err != nil {
l.Printf("access.CanCreate(db, u, e) error: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
} else if !allowed {
l.Print("access.CanCreate(db, u, e) rejected authorization")
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
if err := db.Save(u); err != nil {
l.Printf("error saving record: %s", err)
switch err {
case data.ErrAccessDenial:
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
// These are all equally distressing
case data.ErrNotFound: // TODO shouldn't a not found not be fing impossible for a Save?
fallthrough
case data.ErrNoConnection:
fallthrough
case data.ErrInvalidID:
default:
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
return
}
// Now we shall write our response
b, err := json.MarshalIndent(e, "", " ")
if err != nil {
l.Printf("json.MarshalIndent(m, \"\", \" \") error: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusCreated)
w.Header().Set("Content-Type", "application/json")
w.Write(b)
}
func RecordChangesGET(ctx context.Context, ws *websocket.Conn, db data.DB, logger services.Logger) {
l := logger.WithPrefix("RecordChangesGet: ")
u, ok := user.FromContext(ctx)
if !ok {
l.Print("failed to retrieve user from context")
return
}
// Get the db's changes, then filter by updates, then
// filter by whether this user can read the record
changes := data.Filter(db.Changes(), func(c *data.Change) bool {
ok, err := access.CanRead(db, u, c.Record)
if err != nil {
l.Printf("error checking access control: %s", err)
}
return ok
})
var kind data.Kind
if kindParam := ws.Request().Form.Get(kindParam); kindParam != "" {
kind = data.Kind(kindParam)
if _, ok := models.Kinds[kind]; !ok {
l.Printf("unrecognized kind: %q", kind)
if err := websocket.Message.Send(ws, fmt.Sprintf("The kind %q is not recognized", kind)); err != nil {
if err != io.EOF {
l.Printf("error sending on websocket: %s", err)
}
}
return
}
// If a kind was specified, filter by it
changes = data.FilterKind(changes, kind)
}
for {
select {
case change, ok := <-*changes:
if !ok {
l.Printf("change channel was closed")
return
}
l.Printf("recieved change: %+v", change)
changeTransport := transfer.Change(change)
if err := websocket.JSON.Send(ws, changeTransport); err != nil {
if err != io.EOF {
l.Printf("error sending to socket: %s", err)
}
return
}
case <-time.After(5 * time.Second):
l.Printf("no change in 5 seconds, but still listening")
case <-ctx.Done():
l.Printf("context cancelled")
// context was cancelled
return
}
}
}
// RecordQueryPOST implements gaia's response to a POST request to the '/record/query/' endpoint.
//
// Assumptions: The user has been authenticated.
//
// Proceedings:
//
// Success:
// * StatusOK
//
// Error:
// * InternalServerError: parsing url params,
// * BadRequest: no kind parameter, unrecognized kind
func RecordQueryPOST(ctx context.Context, w http.ResponseWriter, r *http.Request, logger services.Logger, db data.DB) {
l := logger.WithPrefix("RecordQueryPOST: ")
// Parse the form
if err := r.ParseForm(); err != nil {
l.Printf("error parsing form: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// Retrieve the kind parameter
k := r.FormValue(kindParam)
if k == "" {
l.Printf("no kind parameter")
http.Error(w, fmt.Sprintf("You must specify a %q parameter", kindParam), http.StatusBadRequest)
return
}
kind := data.Kind(k)
// Verify the kind is recognized
if !models.Kinds[kind] {
l.Printf("unrecognized kind %q", kind)
http.Error(w, fmt.Sprintf("The kind %q is not recognized", kind), http.StatusBadRequest)
return
}
// Retrieve the limit, batch and skip parameters
lim := r.FormValue(limitParam)
bat := r.FormValue(batchParam)
ski := r.FormValue(skipParam)
// Set up the variables to apply to the query
var limit, batch, skip int
if lim != "" {
limit, _ = strconv.Atoi(lim)
} else if bat != "" {
batch, _ = strconv.Atoi(bat)
} else if ski != "" {
skip, _ = strconv.Atoi(ski)
}
// Read the selection attrs from the body
var requestBody []byte
var err error
defer r.Body.Close()
if requestBody, err = ioutil.ReadAll(r.Body); err != nil {
l.Printf("error while reading request body: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// These are the selectors, unmarshal the request body into them
attrs := make(data.AttrMap)
// only unmarshall if there is any request body
if len(requestBody) > 0 {
if err = json.Unmarshal(requestBody, &attrs); err != nil {
l.Printf("info: request body:\n%s", string(requestBody))
l.Printf("error: while unmarshalling request body, %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
}
// Retrieve the user we are acting on behalf
u, ok := user.FromContext(ctx)
if !ok {
l.Print("failed to retrieve user from context")
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// Load our actual query
var iter data.Iterator
if iter, err = db.Query(kind).Select(attrs).Limit(limit).Batch(batch).Skip(skip).Order(r.Form["order"]...).Execute(); err != nil {
l.Printf("db.Query(%q).Select(%v).Limit(%d).Batch(%d).Skip(%d) error: %s", kind, attrs, limit, batch, skip, err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
fmt.Fprint(w, "[")
first := true
// Iterator through the results and write the response
m := models.ModelFor(kind)
for iter.Next(m) {
if !first {
fmt.Fprint(w, ",")
}
first = false
if ok, err := access.CanRead(db, u, m); err != nil {
// We've hit an error and need to bail
l.Printf("access.CanRead error: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
} else if ok {
bytes, err := json.Marshal(m)
if err != nil {
l.Printf("error marshalling JSON: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
w.Write(bytes)
}
}
if err := iter.Close(); err != nil {
l.Printf("error closing query, %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
fmt.Fprint(w, "]")
}
// Authenticate checks a request's basic authentication, and associates a *models.User with the context
// if so. Otherwise it handles responding to and closing the request.
//
// contextWithUser, authWasSuccessful := routes.Authenticate(ctx, w, r, logger, db)
//
// Use for any requests which expect to act on behalf of a user (which is most)
func Authenticate(ctx context.Context, w http.ResponseWriter, r *http.Request, l services.Logger, db services.DB) (context.Context, bool) {
l = l.WithPrefix("routes.Authenticate: ")
var (
c *models.Credential
u *models.User
err error
)
public, private, ok := r.BasicAuth()
if !ok {
l.Printf("authentication reverting from basic auth to session")
// assume std lib didn't make a mistake, and the BasicAuth simply wasn't given
// fall back to cookie
if sesh, err := session(r, db); err != nil {
switch err {
case http.ErrNoCookie:
l.Printf("no session cookie")
case data.ErrNotFound:
l.Printf("session token not found")
default:
l.Printf("session(r, db) error: %s", err)
}
l.Printf("authentication reverting from cookie to form values")
public, private = r.FormValue(publicParam), r.FormValue(privateParam)
} else if sesh.Valid() {
if u, err := sesh.Owner(db); err != nil {
l.Printf("sesh.Owner(db) error: %s", err)
public, private = r.FormValue(publicParam), r.FormValue(privateParam)
} else {
return user.NewContext(ctx, u), true
}
} else {
l.Printf("session no longer valid")
public, private = r.FormValue(publicParam), r.FormValue(privateParam)
}
}
if c, err = access.Authenticate(db, public, private); err != nil {
l.Printf("authentication of (%s, %s) failed: couldn't find credential: %s", public, private, err)
goto unauthorized // this error is on us, but it manifests as a failure to authenticate
}
if u, err = c.Owner(db); err != nil {
l.Printf("authentication failed: couldn't load user's owner: %s", err)
goto unauthorized // this error is also on us, but also manifests as a failure to authenticate
}
// successful authentications
return user.NewContext(ctx, u), true
// rejection
unauthorized:
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return nil, false
}
// RecordDelete implements gaia's response to a DELETE request to the '/record/' endpoint.
//
// Assumptions: The user has been authenticated.
//
// Proceedings: Parses the url parameters, and retrieves the kind and id parameters (both required).
// Then checks for authorization to delete, carries it out if allowed.
//
// Success:
// * StatusNoContent indicating a succesful deletion
//
// Errors:
// * InternalServerError: failure to parse the parameters, database connections, json marshalling
// * BadRequest: no kind param, unrecognized kind, no id param, invalid id param
// * NotFound: unauthorized, record actually doesn't exist
// * Unauthorized: not authorized to delete that record, database access denial
func RecordDELETE(ctx context.Context, w http.ResponseWriter, r *http.Request, logger services.Logger, db services.DB) {
l := logger.WithPrefix("RecordDELETE: ")
// Parse the form
if err := r.ParseForm(); err != nil {
l.Printf("error parsing form: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// Retrieve the kind parameter
k := r.FormValue(kindParam)
if k == "" {
l.Printf("no kind specified")
http.Error(w, fmt.Sprintf("You must specify a %q parameter", kindParam), http.StatusBadRequest)
return
}
kind := data.Kind(k)
// Retrieve the id parameter
i := r.FormValue(idParam)
if i == "" {
l.Printf("no id specified")
http.Error(w, fmt.Sprintf("You must specify a %q parameter", idParam), http.StatusBadRequest)
return
}
// Verify the kind is recognized
_, ok := models.Kinds[kind]
if !ok {
l.Printf("unrecognized kind: %q", kind)
http.Error(w, fmt.Sprintf("The kind %q is not recognized", kind), http.StatusBadRequest)
return
}
// Verify the id is valid
id, err := db.ParseID(i)
if err != nil {
l.Printf("invalid id: %q, error: %s", i, err)
http.Error(w, fmt.Sprintf("The id %q is invalid", i), http.StatusBadRequest)
return
}
// Get the record, so that we can decide whether we have permission to delete it
m := models.ModelFor(kind)
m.SetID(id)
if err = db.PopulateByID(m); err != nil {
l.Printf("db.PopulateByID error: %s", err)
switch err {
case data.ErrAccessDenial:
fallthrough // don't leak information (were we denied access, this record doesn't exist)
case data.ErrNotFound:
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
case data.ErrNoConnection:
fallthrough
case data.ErrInvalidID:
fallthrough
default:
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
return
}
// Retrieve the user we are authenticated as
u, ok := user.FromContext(ctx)
if !ok {
l.Print("faild to retrieve user from context")
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// check for authorization
if allowed, err := access.CanDelete(db, u, m); err != nil {
// TODO(nclandolfi) standardize this with the POST and GET where we handle the possible errors
l.Printf("RecordDELETE Error: %s", err)
http.Error(w, "database error", http.StatusInternalServerError)
return
} else if !allowed {
// in order to not leak information, we treat this as a not found
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
return
}
if err := db.Delete(m); err != nil {
switch err {
case data.ErrAccessDenial:
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound) // don't leak information
case data.ErrNotFound:
// this shouldn't happen unless it was deleted by another process
// in between when we populated the record by id, in which case it was successful
goto successfulDelete
// all of these errors, we can't guarantee deletion
case data.ErrNoConnection:
fallthrough
case data.ErrInvalidID:
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
default:
l.Printf("RecordDELETE Error: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
return
}
successfulDelete:
w.WriteHeader(http.StatusNoContent)
}
// RecordPOST implements gaia's response to a POST request to the '/record/' endpoint.
//
// Assumptions: The user has been authenticated.
//
// Proceedings: Parses the url parameters, and retrieves the kind parameter (required).
// Then it checks whether the payload record's id is declared, generating one if not.
// Finally, it saves or updates the record, returning the record with corresponding status.
//
// Success:
// * StatusOK with the record as JSON, meaning the record was _updated_
// * StatusCreated with the record as JSON, meaning the record was _created_
//
// Errors:
// * InternalServerError: failure to parse the parameters, database connections, json marshalling
// * BadRequest: no kind param, unrecognized kind
// * NotFound: unauthorized, record actually doesn't exist
// * Unauthorized: not authorized to create/update that record, database access denial
func RecordPOST(ctx context.Context, w http.ResponseWriter, r *http.Request, logger services.Logger, db services.DB) {
l := logger.WithPrefix("RecordPOST: ")
// Parse the form
if err := r.ParseForm(); err != nil {
l.Printf("error parsing form: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// l.Printf("%+v", r)
// Retrieve the kind parameter
k := r.FormValue(kindParam)
if k == "" {
l.Printf("no kind specified")
http.Error(w, fmt.Sprintf("You must specify a %q parameter", kindParam), http.StatusBadRequest)
return
}
kind := data.Kind(k)
// Verify it is a recognized kind
if _, ok := models.Kinds[kind]; !ok {
http.Error(w, fmt.Sprintf("The kind %q is not recognized", kind), http.StatusBadRequest)
return
}
m := models.ModelFor(kind)
var requestBody []byte
var err error
// Now we must read the body of the request
defer r.Body.Close() // don't forget to close it
if requestBody, err = ioutil.ReadAll(r.Body); err != nil {
l.Printf("error while reading request body: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// Now we unmarshal that into the record
if err = json.Unmarshal(requestBody, m); err != nil {
l.Printf("info: request body:\n%s", string(requestBody))
l.Printf("error: while unmarshalling request body, %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// Now we can determine whether we are creating a new record
// or updating an existing one. We expect to be updating...
creation := false
// ...unless the id is empty, in which case we are creating
if m.ID().String() == "" {
m.SetID(db.NewID()) // Be sure to assign it an ID
creation = true
}
// Retrieve our user
u, ok := user.FromContext(ctx)
if !ok {
l.Print("failed to retrieve user from context")
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
var allowed bool
// We need to check either [creation] we can create the record or [!creation]
// we can update the record we are trying to update
if creation {
prop, ok := m.(access.Property)
if !ok {
l.Printf("tried to create record that isn't property")
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
allowed, err = access.CanCreate(db, u, prop)
} else {
allowed, err = access.CanWrite(db, u, m)
}
if err != nil {
l.Printf("access.{CanCreate | CanWrite} error: %s", err)
switch err {
// This indicates that no, you have no access
case data.ErrAccessDenial:
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
// All of these are bad, and considered an internal error
case data.ErrNotFound:
fallthrough
case data.ErrNoConnection:
fallthrough
case data.ErrInvalidID:
fallthrough
default:
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
return
} else if !allowed {
l.Printf("access denied at create/update stage")
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
// If we have made it this far, it only remains to commit the record
if err = db.Save(m); err != nil {
l.Printf("error saving record: %s", err)
switch err {
case data.ErrAccessDenial:
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
// These are all equally distressing
case data.ErrNotFound: // TODO shouldn't a not found not be fing impossible for a Save?
fallthrough
case data.ErrNoConnection:
fallthrough
case data.ErrInvalidID:
default:
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
return
}
// Now we shall write our response
bytes, err := json.MarshalIndent(m, "", " ")
if err != nil {
l.Printf("error marshalling model: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
if creation {
w.WriteHeader(http.StatusCreated)
} else {
w.WriteHeader(http.StatusOK)
}
w.Header().Set("Content-Type", "application/json")
w.Write(bytes)
}
// RecordGET implements gaia's response to a GET request to the '/record/' endpoint.
//
// Assumptions: The user has been authenticated.
//
// Proceedings: Parses the url parameters, retrieving the kind and id parameters (both required).
// Then it loads that record, checks if the user is allowed to access it, if so it returns the model as JSON.
//
// Success:
// * StatusOK with the record as JSON
//
// Errors:
// * InternalServerError: failure to parse the parameters, database connections, json marshalling
// * BadRequest: no kind param, no id param, unrecognized kind, invalid id
// * NotFound: unauthorized, record actually doesn't exist
func RecordGET(ctx context.Context, w http.ResponseWriter, r *http.Request, logger services.Logger, db services.DB) {
l := logger.WithPrefix("RecordGet: ")
// Parse the form value
if err := r.ParseForm(); err != nil {
l.Printf("error parsing form: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// Secure the kind parameter's existence, and superficial validity (i.e., non-empty)
k := r.FormValue(kindParam)
if k == "" {
l.Printf("no kind parameter")
http.Error(w, fmt.Sprintf("You must specify a '%s' parameter", kindParam), http.StatusBadRequest)
return
}
kind := data.Kind(k)
// Secure the id parameter's existence, and superficial validity (i.e., non-empty)
i := r.FormValue(idParam)
if i == "" {
l.Printf("no id parameter")
http.Error(w, fmt.Sprintf("You must specify a '%s' parameter", idParam), http.StatusBadRequest)
return
}
// Ensure the kind is recognized
if _, ok := models.Kinds[kind]; !ok {
l.Printf("unrecognized kind: %q", kind)
http.Error(w, fmt.Sprintf("The kind %q is not recognized", kind), http.StatusBadRequest)
return
}
// Ensure the id is valid
id, err := db.ParseID(i)
if err != nil {
l.Printf("unrecognized id: %q, err: %s", i, err)
http.Error(w, fmt.Sprintf("The id %q is invalid", i), http.StatusBadRequest)
return
}
m := models.ModelFor(kind)
m.SetID(id)
if err := db.PopulateByID(m); err != nil {
switch err {
// ErrAccessDenial and ErrNotFound are "normal" courses, in the sense that they
// may be expected in normal usage.
case data.ErrAccessDenial:
fallthrough // don't leak information, make it look like a 404
case data.ErrNotFound:
// This is, by far, the most common error case here.
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
// ErrNoConnection, ErrInvalidID and the under-determined errors are all non-normal cases
case data.ErrNoConnection:
fallthrough
case data.ErrInvalidID:
fallthrough
default:
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
l.Printf("db.PopulateByID error: %s", err)
return // regardless of what the error was, we are bailing
}
// Retrieve the user this request was authenticated as
u, ok := user.FromContext(ctx)
if !ok { // This is certainly an issue, and should _never_ happen
l.Print("failed to retrieve user from context")
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// Now we impose the system access control, beyond the database access control
// TODO: limit the domain of errors CanRead returns
if allowed, err := access.CanRead(db, u, m); err != nil {
switch err {
// Again, though odd, both of these are arguably expected
case data.ErrAccessDenial:
fallthrough // don't leak information
case data.ErrNotFound:
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
// These are not-expected
case data.ErrNoConnection:
fallthrough
case data.ErrInvalidID:
fallthrough
default:
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
l.Printf("access.CanRead error: %s", err)
return
} else if !allowed {
// If you can't read the record you are asking for,
// it "does not exist" as far as you are concerned
l.Print("access denied")
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
return
}
bytes, err := json.MarshalIndent(m, "", " ")
if err != nil {
l.Printf("error while marshalling json %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusOK)
w.Header().Set("Content-Type", "application/json")
w.Write(bytes)
}
func MobileLocationPOST(ctx context.Context, w http.ResponseWriter, r *http.Request, l services.Logger, db data.DB) {
// Parse the form value
if err := r.ParseForm(); err != nil {
l.Printf("MobileLocationPOST Error: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// Altitude
alt := r.FormValue(altitudeParam)
if alt == "" {
http.Error(w, "You must specify an altitude", http.StatusBadRequest)
return
}
altitude, err := strconv.ParseFloat(alt, 64)
if err != nil {
http.Error(w, "Parsing altitude", http.StatusBadRequest)
return
}
// Latitude
lat := r.FormValue(latitudeParam)
if lat == "" {
http.Error(w, "You must specify a latitude", http.StatusBadRequest)
return
}
latitude, err := strconv.ParseFloat(lat, 64)
if err != nil {
http.Error(w, "Parsing latitude", http.StatusBadRequest)
return
}
// Longitude
lon := r.FormValue(longitudeParam)
if lon == "" {
http.Error(w, "You must specify an longitude", http.StatusBadRequest)
return
}
longitude, err := strconv.ParseFloat(lon, 64)
if err != nil {
http.Error(w, "Parsing longitude", http.StatusBadRequest)
return
}
// Retrieve the user this request was authenticated as
u, ok := user.FromContext(ctx)
if !ok { // This is certainly an issue, and should _never_ happen
l.Print("MobileLocationPOST Error: failed to retrieve user from context")
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
// Create location
loc := location.NewCoords(altitude, latitude, longitude)
loc.SetID(db.NewID())
loc.SetOwner(u)
now := loc.CreatedAt
e := models.NewEvent()
e.CreatedAt = now
e.SetID(db.NewID())
e.SetOwner(u)
e.Name = "Location Update"
e.SetLocation(loc)
e.Time = now
e.UpdatedAt = now
locationTag, err1 := tag.ForName(db, u, tag.Location)
updateTag, err2 := tag.ForName(db, u, tag.Update)
mobileTag, err3 := tag.ForName(db, u, tag.Mobile)
if err1 != nil || err2 != nil || err3 != nil {
l.Printf("MobileLocationPOST Error: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
e.IncludeTag(locationTag)
e.IncludeTag(updateTag)
e.IncludeTag(mobileTag)
if err = db.Save(loc); err != nil {
l.Printf("MobileLocationPOST Error: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
if err = db.Save(e); err != nil {
l.Printf("MobileLocationPOST Error: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
bytes, err := json.MarshalIndent(e, "", " ")
if err != nil {
l.Printf("MobileLocationPOST Error: while marshalling json %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusCreated)
w.Header().Set("Content-Type", "application/json")
w.Write(bytes)
}