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protocol.go
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protocol.go
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package alexandriaMedia
import (
"database/sql"
"encoding/json"
"errors"
"fmt"
"log"
"regexp"
"strconv"
"strings"
"github.com/metacoin/flojson"
"github.com/metacoin/foundation"
)
var ()
const MEDIA_ROOT_KEY = "alexandria-media"
const PUBLISHER_ROOT_KEY = "alexandria-publisher"
const DEACTIVATION_ROOT_KEY = "alexandria-deactivation"
const MIN_BLOCK = 1045632
// media structs
type AlexandriaMedia struct {
AlexandriaMedia struct {
// required media metadata
Torrent string `json:"torrent"`
Publisher string `json:"publisher"`
Timestamp int64 `json:"timestamp"`
Type string `json:"type"`
Info struct {
// required file information
Title string `json:"title"`
Description string `json:"description"`
Year int `json:"year"`
// optional extra-info field
ExtraInfo interface{} `json:"extra-info"`
} `json:"info"`
// optional fields
Payment interface{} `json:"payment"`
Extras string `json:"extras"`
} `json:"alexandria-media"`
Signature string `json:"signature"`
}
type AlexandriaPublisher struct {
AlexandriaPublisher struct {
// required publisher metadata
Name string `json:"name"`
Address string `json:"address"`
Timestamp int64 `json:"timestamp"`
// optional fields
Emailmd5 string `json:"emailmd5"`
Bitmessage string `json:"bitmessage"`
} `json:"alexandria-publisher"`
Signature string `json:"signature"`
}
type AlexandriaDeactivation struct {
AlexandriaDeactivation struct {
// required txid and address fields
Txid string `json:"txid"`
Address string `json:"address"`
} `json:"alexandria-deactivation"`
Signature string `json:"signature"`
}
// multipart struct
type MediaMultipartSingle struct {
Part int
Max int
Reference string
Address string
Signature string
Data string
Txid string
Block int
}
// reference: Cory LaNou, Mar 2 '14 at 15:21, http://stackoverflow.com/a/22129435/2576956
func IsJSON(s string) bool {
var js map[string]interface{}
return json.Unmarshal([]byte(s), &js) == nil
}
func VerifyDeactivation(b []byte) (AlexandriaDeactivation, error) {
var v AlexandriaDeactivation
var i interface{}
var m map[string]interface{}
if !IsJSON(string(b)) {
return v, errors.New("this string isn't even JSON!")
}
err := json.Unmarshal(b, &v)
if err != nil {
return v, err
}
errr := json.Unmarshal(b, &i)
if errr != nil {
return v, err
}
m = i.(map[string]interface{})
var signature string
// check the JSON object root key
// find the signature string
for key, val := range m {
if key == "signature" {
signature = val.(string)
} else {
if key != DEACTIVATION_ROOT_KEY {
return v, errors.New("can't verify deactivation - JSON object root key doesn't match accepted value")
}
}
}
// verify txid
rt := regexp.MustCompile("^[a-fA-F0-9]*$")
if !rt.MatchString(v.AlexandriaDeactivation.Txid) || len(v.AlexandriaDeactivation.Txid) != 64 {
return v, errors.New("can't verify deactivation - txid in incorrect format")
}
// verify address
ra := regexp.MustCompile("^[a-zA-Z0-9]*$")
if !ra.MatchString(v.AlexandriaDeactivation.Address) || len(v.AlexandriaDeactivation.Address) != 34 {
return v, errors.New("can't verify deactivation - address in incorrect format")
}
// verify signature
if v.Signature != signature {
return v, errors.New("can't verify deactivation - signature mismatch")
}
// verify signature was created by this address
// signature pre-image for deactivation is <address>-<txid>
if checkSignature(v.AlexandriaDeactivation.Address, signature, v.AlexandriaDeactivation.Address+"-"+v.AlexandriaDeactivation.Txid) == false {
return v, errors.New("can't verify deactivation - message failed to pass signature verification")
}
return v, nil
}
func VerifyPublisher(b []byte) (AlexandriaPublisher, error) {
var v AlexandriaPublisher
var i interface{}
var m map[string]interface{}
// fmt.Printf("Attempting to verify alexandria-publisher JSON...")
if !IsJSON(string(b)) {
return v, errors.New("this string isn't even JSON!")
}
err := json.Unmarshal(b, &v)
if err != nil {
return v, err
}
errr := json.Unmarshal(b, &i)
if errr != nil {
return v, err
}
m = i.(map[string]interface{})
var signature string
// check the JSON object root key
// find the signature string
for key, val := range m {
if key == "signature" {
signature = val.(string)
} else {
if key != PUBLISHER_ROOT_KEY {
return v, errors.New("can't verify publisher - JSON object root key doesn't match accepted value")
}
}
}
// verify signature
if v.Signature != signature {
return v, errors.New("can't verify publisher - signature mismatch")
}
// verify signature was created by this address
// signature pre-image for publisher is <name>-<address>-<timestamp>
if checkSignature(v.AlexandriaPublisher.Address, signature, v.AlexandriaPublisher.Name+"-"+v.AlexandriaPublisher.Address+"-"+strconv.FormatInt(v.AlexandriaPublisher.Timestamp, 10)) == false {
return v, errors.New("can't verify publisher - message failed to pass signature verification")
}
// fmt.Println(" -- VERIFIED --")
return v, nil
}
func StoreMediaMultipartSingle(mms MediaMultipartSingle, dbtx *sql.Tx) {
// store in database
stmtstr := `insert into media_multipart (part, max, address, reference, signature, data, txid, block, complete, success, active) values (` + strconv.Itoa(mms.Part) + `, ` + strconv.Itoa(mms.Max) + `, ?, ?, ?, ?, "` + mms.Txid + `", ` + strconv.Itoa(mms.Block) + `, 0, 0, 1)`
stmt, err := dbtx.Prepare(stmtstr)
if err != nil {
fmt.Println("exit 160")
log.Fatal(err)
}
_, stmterr := stmt.Exec(mms.Address, mms.Reference, mms.Signature, mms.Data)
if stmterr != nil {
fmt.Println("exit 161")
log.Fatal(stmterr)
}
stmt.Close()
}
func DeactivateMedia(deactiv AlexandriaDeactivation, dbtx *sql.Tx) error {
stmtstr := `update media set invalidated = 1 where publisher = "` + deactiv.AlexandriaDeactivation.Address + `" and txid = "` + deactiv.AlexandriaDeactivation.Txid + `"`
stmt, err := dbtx.Prepare(stmtstr)
if err != nil {
return err
}
_, stmterr := stmt.Exec()
if stmterr != nil {
return stmterr
}
stmt.Close()
return nil
}
func CheckPublisherAddressExists(address string, dbtx *sql.Tx) bool {
// check if this publisher address is already in-use
stmtstr := `select name from publisher where address = ?`
rows, stmterr := dbtx.Query(stmtstr, address)
if stmterr != nil {
fmt.Println("exit 91248")
log.Fatal(stmterr)
}
var rowsCount int = 0
for rows.Next() {
rowsCount++
}
rows.Close()
return rowsCount > 0
}
func CheckMediaMultipartComplete(reference string, dbtx *sql.Tx) ([]byte, error) {
// using the reference tx, check how many different txs we have and determine if we have all transactions
// if we have a valid media-multipart complete instance, let's return the byte array it consists of
var ret []byte
stmtstr := `select part, max, data from media_multipart where active = 1 and complete = 0 and reference = "` + reference + `" order by part asc`
stmt, err := dbtx.Prepare(stmtstr)
if err != nil {
fmt.Println("exit 120")
log.Fatal(err)
}
rows, stmterr := stmt.Query()
if err != nil {
fmt.Println("exit 121")
log.Fatal(stmterr)
}
var rowsCount int = 0
var pmax int
var fullData string
for rows.Next() {
var part int
var max int
var data string
rows.Scan(&part, &max, &data)
// TODO: require signature verification for multipart messages
if rowsCount > max {
return ret, errors.New("too many rows in multipart message - check for reorg/bogus multipart data")
}
rowsCount++
pmax = max
fullData += data
}
if rowsCount != pmax+1 {
return ret, errors.New("only found " + strconv.Itoa(rowsCount) + "/" + strconv.Itoa(pmax+1) + " multipart messages")
}
stmt.Close()
rows.Close()
// set complete to 1
updatestr := `update media_multipart set complete = 1 where reference = "` + reference + `"`
updatestmt, updateerr := dbtx.Prepare(updatestr)
if updateerr != nil {
fmt.Println("exit 122")
log.Fatal(updateerr)
}
_, updatestmterr := updatestmt.Exec()
if updatestmterr != nil {
fmt.Println("exit 123")
log.Fatal(updatestmterr)
}
updatestmt.Close()
return []byte(fullData), nil
}
func UpdateMediaMultipartSuccess(reference string, dbtx *sql.Tx) {
stmtstr := `update media_multipart set success = 1 where reference = "` + reference + `"`
stmt, err := dbtx.Prepare(stmtstr)
if err != nil {
fmt.Println("exit 140")
log.Fatal(err)
}
_, stmterr := stmt.Exec()
if err != nil {
fmt.Println("exit 141")
log.Fatal(stmterr)
}
}
func VerifyMediaMultipartSingle(s string, txid string, block int) (MediaMultipartSingle, error) {
var ret MediaMultipartSingle
prefix := "alexandria-media-multipart("
// check prefix
checkPrefix := strings.HasPrefix(s, prefix)
if !checkPrefix {
return ret, errors.New("wrong prefix in tx-comment (does not match required prefix)")
}
// trim prefix off
s = strings.TrimPrefix(s, prefix)
// check length
if len(s) < 108 {
return ret, errors.New("not enough data in mutlipart string")
}
// check part and max
part, err := strconv.Atoi(string(s[0]))
if err != nil {
fmt.Println("cannot convert part to int")
return ret, errors.New("cannot convert part to int")
}
max, err2 := strconv.Atoi(string(s[2]))
if err2 != nil {
fmt.Println("cannot convert max to int")
return ret, errors.New("cannot convert max to int")
}
// get and check address
address := s[4:38]
if !CheckAddress(address) {
// fmt.Println("address doesn't check out: \"" + address + "\"")
return ret, errors.New("address doesn't validate using validateaddress")
}
// get reference txid
reference := s[39:103]
// get and check signature
sigEndIndex := strings.Index(s, "):")
if sigEndIndex == -1 {
fmt.Println("no end of signature found, malformed tx-comment")
return ret, errors.New("no end of signature found, malformed tx-comment")
}
signature := s[104:sigEndIndex]
data := s[sigEndIndex+2:]
// fmt.Println("data: \"" + data + "\"")
// signature pre-image is <part>-<max>-<address>-<txid>-<data>
// in the case of multipart[0], txid is 64 zeros
// in the case of multipart[n], where n != 0, txid is the reference txid (from multipart[0])
preimage := string(s[0]) + "-" + string(s[2]) + "-" + address + "-" + reference + "-" + data
// fmt.Printf("preimage: %v\n", preimage)
if !checkSignature(address, signature, preimage) {
// fmt.Println("signature didn't pass checksignature test")
return ret, errors.New("signature didn't pass checksignature test")
}
// if part == 0, reference should be submitted in the tx-comment as a string of 64 zeros
// the local DB will store reference = txid for this transaction after it's submitted
// in case of a reorg, the publisher must re-publish this multipart message (sorry)
if part == 0 {
if reference != "0000000000000000000000000000000000000000000000000000000000000000" {
// fmt.Println("reference txid should be 64 zeros for part 0 of a multipart message")
return ret, errors.New("reference txid should be 64 zeros for part 0")
}
reference = txid
}
// all checks passed, verified!
//fmt.Printf("data: %v\n", data)
// fmt.Printf("=== VERIFIED ===\n")
//fmt.Printf("part: %v\nmax: %v\nreference: %v\naddress: %v\nsignature: %v\ntxid: %v\nblock: %v\n", part, max, reference, address, signature, txid, block)
ret = MediaMultipartSingle{
Part: part,
Max: max,
Reference: reference,
Address: address,
Signature: signature,
Data: data,
Txid: txid,
Block: block,
}
return ret, nil
}
func VerifyMedia(b []byte) (AlexandriaMedia, map[string]interface{}, error) {
var v AlexandriaMedia
var i interface{}
var m map[string]interface{}
// fmt.Printf("Attempting to verify alexandria-media JSON...")
err := json.Unmarshal(b, &v)
if err != nil {
return v, m, err
}
errr := json.Unmarshal(b, &i)
if errr != nil {
return v, m, err
}
m = i.(map[string]interface{})
var signature string
// check the JSON object root key
// find the signature string
for key, val := range m {
if key == "signature" {
signature = val.(string)
} else {
if key != MEDIA_ROOT_KEY {
return v, m, errors.New("can't verify media - JSON object root key doesn't match accepted value")
}
}
}
// fmt.Printf("*** debug: JSON object root matches, printing v:\n%v\n*** /debug ***\n", v)
// verify torrent hash length
if len(v.AlexandriaMedia.Torrent) <= 1 {
return v, m, errors.New("can't verify media - invalid torrent hash length")
}
// verify signature
if v.Signature != signature {
return v, m, errors.New("can't verify media - signature mismatch")
}
// verify timestamp length
if v.AlexandriaMedia.Timestamp <= 0 {
return v, m, errors.New("can't verify media - invalid timestamp")
}
// verify type length
if len(v.AlexandriaMedia.Type) <= 1 {
return v, m, errors.New("can't verify media - invalid type length")
}
// verify media info lengths
if len(v.AlexandriaMedia.Info.Title) <= 0 {
return v, m, errors.New("can't verify media - invalid info title length")
}
if len(v.AlexandriaMedia.Info.Description) <= 0 {
return v, m, errors.New("can't verify media - invalid info description length")
}
if v.AlexandriaMedia.Info.Year <= 0 {
return v, m, errors.New("can't verify media - invalid info year")
}
// verify signature was created by this address
// signature pre-image for media is <torrenthash>-<publisher>-<timestamp>
if checkSignature(v.AlexandriaMedia.Publisher, signature, v.AlexandriaMedia.Torrent+"-"+v.AlexandriaMedia.Publisher+"-"+strconv.FormatInt(v.AlexandriaMedia.Timestamp, 10)) == false {
return v, m, errors.New("can't verify media - message failed to pass signature verification")
}
// fmt.Println(" -- VERIFIED --")
return v, m, nil
}
func StorePublisher(publisher AlexandriaPublisher, dbtx *sql.Tx, txid string, block int, hash string) {
// store in database
stmtstr := `insert into publisher (name, address, timestamp, txid, block, emailmd5, bitmessage, hash, signature, active) values (?, ?, ?, "` + txid + `", ` + strconv.Itoa(block) + `, ?, ?, "` + hash + `", ?, 1)`
stmt, err := dbtx.Prepare(stmtstr)
if err != nil {
fmt.Println("exit 100")
log.Fatal(err)
}
_, stmterr := stmt.Exec(publisher.AlexandriaPublisher.Name, publisher.AlexandriaPublisher.Address, publisher.AlexandriaPublisher.Timestamp, publisher.AlexandriaPublisher.Emailmd5, publisher.AlexandriaPublisher.Bitmessage, publisher.Signature)
if err != nil {
fmt.Println("exit 101")
log.Fatal(stmterr)
}
stmt.Close()
}
func StoreMedia(media AlexandriaMedia, jmap map[string]interface{}, dbtx *sql.Tx, txid string, block int, multipart int) {
// check for media payment data
payment, payment_err := extractMediaPayment(jmap)
paymentString := ""
if payment_err != nil {
fmt.Printf("payment data not found/failed - error returned: %v\n", payment_err)
} else {
paymentString = string(payment)
}
// check for media info extras
extraInfo, ei_err := extractMediaExtraInfo(jmap)
extraInfoString := ""
if ei_err != nil {
fmt.Printf("extra info not found/failed - error returned: %v\n", ei_err)
} else {
extraInfoString = string(extraInfo)
}
// make sure extras is stored as an empty string if it doesn't exist
if len(media.AlexandriaMedia.Extras) < 1 {
media.AlexandriaMedia.Extras = ""
}
stmtstr := `insert into media (publisher, torrent, timestamp, type, info_title, info_description, info_year, info_extra, payment, extras, txid, block, signature, multipart, active) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, "` + txid + `", ` + strconv.Itoa(block) + `, ?, ` + strconv.Itoa(multipart) + `, 1)`
stmt, err := dbtx.Prepare(stmtstr)
if err != nil {
fmt.Println("exit 102")
log.Fatal(err)
}
// fmt.Printf("stmt: %v\n", stmt)
_, stmterr := stmt.Exec(media.AlexandriaMedia.Publisher, media.AlexandriaMedia.Torrent, media.AlexandriaMedia.Timestamp, media.AlexandriaMedia.Type, media.AlexandriaMedia.Info.Title, media.AlexandriaMedia.Info.Description, media.AlexandriaMedia.Info.Year, extraInfoString, paymentString, media.AlexandriaMedia.Extras, media.Signature)
if stmterr != nil {
fmt.Println("exit 103")
log.Fatal(stmterr)
}
stmt.Close()
}
func CreateNewPublisherTxComment(b []byte) {
// given some JSON, post it to the blockchain using either a tx-comment or multipart tx-comment
}
// some helper functions here
func checkSignature(address string, signature string, message string) bool {
reply, err := foundation.RPCCall("verifymessage", address, signature, message)
if err != nil {
fmt.Println("foundation error: " + err.Error())
return false
}
if reply == true {
return true
}
return false
}
func CheckAddress(address string) bool {
reply, err := foundation.RPCCall("validateaddress", address)
if err != nil {
fmt.Println("foundation error: " + err.Error())
return false
}
result, ok := reply.(*flojson.ValidateAddressResult)
if !ok {
return false
}
if result.IsValid == true {
return true
}
return false
}
func extractMediaPayment(jmap map[string]interface{}) ([]byte, error) {
// find the "payment" json object
var ret []byte
for k, v := range jmap {
if k == "alexandria-media" {
vm := v.(map[string]interface{})
for k2, v2 := range vm {
if k2 == "payment" {
// fmt.Printf("v3(%v): %v\n\n", reflect.TypeOf(v3), v3)
v2json, err := json.Marshal(v2)
if err != nil {
return ret, err
}
return v2json, nil
}
}
}
}
return ret, errors.New("no payment extra info found")
}
func extractMediaExtraInfo(jmap map[string]interface{}) ([]byte, error) {
// find the "extra info" json object
var ret []byte
for k, v := range jmap {
if k == "alexandria-media" {
vm := v.(map[string]interface{})
for k2, v2 := range vm {
if k2 == "info" {
v2m := v2.(map[string]interface{})
for k3, v3 := range v2m {
if k3 == "extra-info" {
// fmt.Printf("v3(%v): %v\n\n", reflect.TypeOf(v3), v3)
v3json, err := json.Marshal(v3)
if err != nil {
return ret, err
}
return v3json, nil
}
}
}
}
}
}
return ret, errors.New("no media extra info found")
}