188 lines
3.3 KiB
Go
188 lines
3.3 KiB
Go
package client
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import (
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"encoding/json"
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"fmt"
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"io"
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"maps"
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"net"
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"github.com/LandaMm/hsp-go/hsp"
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)
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type ClientOptions struct {
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Headers map[string]string
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// TODO: in future support multiple types of auth (credentials, key etc.)
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Auth string
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BaseURL string
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}
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type Client struct {
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Options *ClientOptions
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Base *hsp.Adddress
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}
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func NewClient(options *ClientOptions) *Client {
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if options == nil {
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options = &ClientOptions{}
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}
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var base *hsp.Adddress
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if len(options.BaseURL) > 0 {
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addr, err := hsp.ParseAddress(options.BaseURL)
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if err == nil {
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base = addr
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}
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}
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return &Client{
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Options: options,
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Base: base,
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}
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}
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func (c *Client) BuildHeaders(address *hsp.Adddress, df *hsp.DataFormat) map[string]string {
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headers := make(map[string]string)
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if len(c.Options.Headers) > 0 {
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maps.Copy(headers, c.Options.Headers)
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}
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headers[hsp.H_ROUTE] = address.Route
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headers[hsp.H_DATA_FORMAT] = df.String()
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if len(c.Options.Auth) > 0 {
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headers[hsp.H_AUTH] = c.Options.Auth
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}
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return headers
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}
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func (c *Client) SingleHit(addr *hsp.Adddress, pkt *hsp.Packet) (*hsp.Packet, error) {
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rawConn, err := net.Dial("tcp", addr.String())
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if err != nil {
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return nil, err
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}
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defer rawConn.Close()
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keys, err := hsp.GenerateKeyPair()
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if err != nil {
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return nil, err
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}
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n, err := rawConn.Write(keys.Public[:])
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if err != nil {
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return nil, err
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}
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if n != 32 {
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return nil, fmt.Errorf("failed to send 32 bytes of key (%d sent instead)", n)
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}
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serverKey := make([]byte, 32)
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if _, err := io.ReadFull(rawConn, serverKey); err != nil {
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return nil, err
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}
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sharedKey, err := hsp.DeriveSharedKey(keys.Private, [32]byte(serverKey))
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if err != nil {
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return nil, err
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}
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conn := hsp.NewConnection(rawConn, keys, sharedKey)
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if _, err := conn.Write(pkt); err != nil {
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return nil, err
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}
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return conn.Read()
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}
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func (c *Client) SendText(address, text string) (*hsp.Response, error) {
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var addr *hsp.Adddress
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var err error
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if c.Base != nil {
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addr, err = c.Base.Extend(address)
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} else {
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addr, err = hsp.ParseAddress(address)
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}
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if err != nil {
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return nil, err
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}
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payload := []byte(text)
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hdrs := c.BuildHeaders(addr, hsp.TextDataFormat())
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pkt := hsp.BuildPacket(hdrs, payload)
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rpkt, err := c.SingleHit(addr, pkt)
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if err != nil {
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return nil, err
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}
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return hsp.NewPacketResponse(rpkt), nil
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}
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func (c *Client) SendJson(address string, data any) (*hsp.Response, error) {
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var addr *hsp.Adddress
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var err error
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if c.Base != nil {
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addr, err = c.Base.Extend(address)
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} else {
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addr, err = hsp.ParseAddress(address)
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}
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if err != nil {
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return nil, err
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}
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payload, err := json.Marshal(data)
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if err != nil {
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return nil, err
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}
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hdrs := c.BuildHeaders(addr, hsp.JsonDataFormat())
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pkt := hsp.BuildPacket(hdrs, payload)
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rpkt, err := c.SingleHit(addr, pkt)
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if err != nil {
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return nil, err
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}
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return hsp.NewPacketResponse(rpkt), nil
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}
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func (c *Client) SendBytes(address string, data []byte) (*hsp.Response, error) {
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var addr *hsp.Adddress
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var err error
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if c.Base != nil {
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addr, err = c.Base.Extend(address)
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} else {
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addr, err = hsp.ParseAddress(address)
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}
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if err != nil {
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return nil, err
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}
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hdrs := c.BuildHeaders(addr, hsp.BytesDataFormat())
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pkt := hsp.BuildPacket(hdrs, data)
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rpkt, err := c.SingleHit(addr, pkt)
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if err != nil {
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return nil, err
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}
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return hsp.NewPacketResponse(rpkt), nil
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}
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