Golang Context.FindString方法代码示例

// PostUpdateNode removes a Node of a given IP from the database and
// re-adds it with the supplied information. It is the equivalent of
// removing a Node from the database, then invoking PostNode() with
// its information, with the exception that it does not send a
// verification email, and requires that the request be sent by the
// Node that is being update.
func (*Api) PostUpdateNode(ctx *jas.Context) {
	if Db.ReadOnly {
		// If the database is readonly, set that as the error and
		// return.
		ctx.Error = ReadOnlyError
		return
	}
	var err error

	// Require a token, because this is a very sensitive endpoint.
	RequireToken(ctx)

	// Retrieve the given IP address, check that it's sane, and check
	// that it exists in the *local* database.
	ip := IP(net.ParseIP(ctx.RequireStringLen(0, 40, "address")))
	if ip == nil {
		// If the address is invalid, return that error.
		ctx.Error = jas.NewRequestError("addressInvalid")
		return
	}

	node, err := Db.GetNode(ip)
	if err != nil {
		ctx.Error = jas.NewInternalError(err.Error())
		return
	}

	if node == nil || len(node.OwnerEmail) == 0 {
		ctx.Error = jas.NewRequestError("no matching local node")
		return
	}

	// Check to make sure that the Node is the one sending the
	// address, or an admin. If not, return an error.
	if !net.IP(ip).Equal(net.ParseIP(ctx.RemoteAddr)) &&
		!IsAdmin(ctx.Request) {
		ctx.Error = jas.NewRequestError(
			RemoteAddressDoesNotMatchError.Error())
		return
	}

	node.Addr = ip
	node.Latitude = ctx.RequireFloat("latitude")
	node.Longitude = ctx.RequireFloat("longitude")
	node.OwnerName = html.EscapeString(ctx.RequireString("name"))
	node.Contact, err = ctx.FindString("contact")
	if err != nil {
		ctx.Error = jas.NewRequestError("someError")
		return
	}
	node.Contact = html.EscapeString(node.Contact)
	node.Details, err = ctx.FindString("details")
	if err != nil {
		ctx.Error = jas.NewRequestError("someError")
		return
	}
	node.Details = html.EscapeString(node.Details)

	// If Contact, Details, or OwnerName are too long to fit in
	// the database, produce an error.
	if len(node.Contact) > 255 {
		ctx.Error = jas.NewRequestError("contactTooLong")
		return
	}
	if len(node.Details) > 255 {
		ctx.Error = jas.NewRequestError("detailsTooLong")
		return
	}
	if len(node.OwnerName) > 255 {
		ctx.Error = jas.NewRequestError("ownerNameTooLong")
		return
	}

	// Validate the PGP ID, if given. It can be an lowercase hex
	// string of length 0, 8, or 16.
	pgpstr, _ := ctx.FindStringMatch(PGPRegexp, "pgp")
	if node.PGP, err = DecodePGPID([]byte(pgpstr)); err != nil {
		ctx.Error = jas.NewRequestError("pgpInvalid")
		return
	}
	status, _ := ctx.FindPositiveInt("status")
	node.Status = uint32(status)

	// Note that we do not perform a verification step here, or send
	// an email. Because the Node was already verified once, we can
	// assume that it remains usable.

	// Update the Node in the database, replacing the one of matching
	// IP.
	err = Db.UpdateNode(node)
	if err != nil {
		ctx.Error = jas.NewInternalError(err)
		l.Errf("Error updating %q: %s", node.Addr, err)
		return
//.........这里部分代码省略.........

// PostNode creates a *Node from the submitted form and queues it for
// addition with a positive 64 bit integer as an ID.
func (*Api) PostNode(ctx *jas.Context) {
	if Db.ReadOnly {
		// If the database is readonly, set that as the error and
		// return.
		ctx.Error = ReadOnlyError
		return
	}
	var err error

	// Require a token, because this is mildly sensitive.
	RequireToken(ctx)

	// Initialize the node and retrieve fields.
	node := new(Node)

	ip := IP(net.ParseIP(ctx.RequireStringLen(0, 40, "address")))
	if ip == nil {
		// If the address is invalid, return that error.
		ctx.Error = jas.NewRequestError("addressInvalid")
		return
	}
	node.Addr = ip
	node.Latitude = ctx.RequireFloat("latitude")
	node.Longitude = ctx.RequireFloat("longitude")
	node.OwnerName = html.EscapeString(ctx.RequireString("name"))
	node.OwnerEmail = ctx.RequireStringMatch(EmailRegexp, "email")

	node.Contact, _ = ctx.FindString("contact")
	node.Contact = html.EscapeString(node.Contact)

	node.Details, _ = ctx.FindString("details")
	node.Details = html.EscapeString(node.Details)

	// If Contact, Details, or OwnerName are too long to fit in
	// the database, produce an error.
	if len(node.Contact) > 255 {
		ctx.Error = jas.NewRequestError("contactTooLong")
		return
	}
	if len(node.Details) > 255 {
		ctx.Error = jas.NewRequestError("detailsTooLong")
		return
	}
	if len(node.OwnerName) > 255 {
		ctx.Error = jas.NewRequestError("ownerNameTooLong")
		return
	}

	// Validate the PGP ID, if given. It can be an lowercase hex
	// string of length 0, 8, or 16.
	pgpstr, _ := ctx.FindStringMatch(PGPRegexp, "pgp")
	if node.PGP, err = DecodePGPID([]byte(pgpstr)); err != nil {
		ctx.Error = jas.NewRequestError("pgpInvalid")
		return
	}
	status, _ := ctx.FindPositiveInt("status")
	node.Status = uint32(status)

	// Ensure that the node is correct and usable.
	if err = Db.VerifyRegistrant(node); err != nil {
		ctx.Error = jas.NewRequestError(err.Error())
		return
	}

	// TODO(DuoNoxSol): Authenticate/limit node registration.

	// If SMTP is missing from the config, we cannot continue.
	if Conf.SMTP == nil {
		ctx.Error = jas.NewInternalError(SMTPDisabledError)
		l.Err(SMTPDisabledError)
		return
	}

	// If SMTP verification is not explicitly disabled, and the
	// connecting address is not an admin, send an email.
	if !Conf.SMTP.VerifyDisabled && !IsAdmin(ctx.Request) {
		id := rand.Int63() // Pseudo-random positive int64

		emailsent := true
		if err := SendVerificationEmail(id, node.OwnerEmail); err != nil {
			// If the sending of the email fails, set the internal
			// error and log it, then set a bool so that email can be
			// resent. If email continues failing to send, it will
			// eventually expire and be removed from the database.
			ctx.Error = jas.NewInternalError(err)
			l.Err(err)
			emailsent = false
			// Note that we do *not* return here.
		}

		// Once we have attempted to send the email, queue the node
		// for verification. If the email has not been sent, it will
		// be recorded in the database.
		if err := Db.QueueNode(id, emailsent,
			Conf.VerificationExpiration, node); err != nil {
			// If there is a database failure, report it as an
			// internal error.
			ctx.Error = jas.NewInternalError(err)
//.........这里部分代码省略.........