/
api.go
406 lines (363 loc) · 10.7 KB
/
api.go
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package api
import (
"bytes"
"encoding/json"
"fmt"
"log"
"net/http"
"reflect"
"regexp"
"strings"
"text/template"
"time"
"github.com/jmoiron/sqlx"
"github.com/labstack/echo/v4"
"github.com/lib/pq"
sqlite3 "github.com/mattn/go-sqlite3"
// Need to add postgres driver
"github.com/getkin/kin-openapi/openapi3"
"github.com/jackc/pgerrcode"
"github.com/jackc/pgx"
"github.com/jackc/pgx/stdlib"
)
var openapi string
const sanitizeRegex = "[A-Za-z][A-Za-z0-9_]*"
var sqlSanitize = regexp.MustCompile(sanitizeRegex)
func supportedTypes() []string {
return []string{
"real", "text", "boolean",
}
}
// API - API object
type API struct {
sql databaseInterface
securityQueries map[string]string
}
// NewAPI - Create new Postgres API
func NewApi(jdbc string) *API {
match := regexp.MustCompile(
"jdbc:(?P<dbtype>.+)://(?P<host>[^:]+):?(?P<port>[0-9]*)/?(?P<database>.*)",
).FindStringSubmatch(jdbc)
var db *sqlx.DB
switch match[1] {
case "postgres":
connConfig := pgx.ConnConfig{
Host: match[2],
Database: match[4],
User: "postgres",
Password: "postgres",
}
connPool, err := pgx.NewConnPool(pgx.ConnPoolConfig{
ConnConfig: connConfig,
AfterConnect: nil,
MaxConnections: 20,
AcquireTimeout: 30 * time.Second,
})
if err != nil {
log.Fatalln(err)
}
db = sqlx.NewDb(stdlib.OpenDBFromPool(connPool), "pgx")
_, err = db.Exec("CREATE ROLE anon")
if err != nil {
log.Println("Failed to create anon role:", err)
}
case "sqlite3":
var err error
db, err = sqlx.Open("sqlite3", "file:"+match[2]+"?mode=memory&cache=shared")
if err != nil {
log.Fatal(err)
}
default:
log.Fatal("Unsupported database", match[1])
}
return &API{sql: databaseBackend{db}}
}
func convertPath(path string) string {
return regexp.MustCompile(`\{([a-z]+)\}`).ReplaceAllString(path, ":$1")
}
// GetServer - Returns LabStack Echo Server
func (api *API) GetServer(swaggerpath string) *echo.Echo {
e := echo.New()
swagger, err := openapi3.NewSwaggerLoader().LoadSwaggerFromFile(swaggerpath)
if err != nil {
log.Fatal("Failed to load swagger", err)
}
for path, item := range swagger.Paths {
for method, op := range item.Operations() {
if grest, ok := op.Extensions["x-grest"]; ok {
queries := map[string][]map[string]interface{}{} // Fun type
if err := json.Unmarshal(grest.(json.RawMessage), &queries); err != nil {
log.Fatal(
"Failed to parse x-grest at",
path, " ", method, " : ", err,
" ", string(grest.(json.RawMessage)),
)
}
templates := []*template.Template{}
for i, query := range queries["queries"] {
sql, ok := query["sql"]
if !ok {
log.Fatal("Failed to get 'sql' from GREST Swagger extension at", path, method)
}
templates = append(templates, template.Must(template.New(
fmt.Sprintf("%s %s %d", path, method, i),
).Parse(sql.(string))))
}
// Copy out params
params := []openapi3.Parameter{}
for i, param := range op.Parameters {
params = append(params, *param.Value)
if template, ok := params[i].Extensions["x-grest-template-allowed"]; ok {
if _, ok := template.(json.RawMessage); ok {
params[i].Extensions["x-grest-template-allowed"] = strings.ToLower(
string(template.(json.RawMessage))) == "true"
}
// Final check
if _, ok := params[i].Extensions["x-grest-template-allowed"].(bool); !ok {
log.Fatal(
"Extension x-grest-template-allowed must be boolean on",
path, " ", method, " ", params[i].Name,
" not ", reflect.TypeOf(template),
)
}
}
}
bodyAllowed := false
if op.RequestBody != nil {
if template, ok := op.RequestBody.Value.Extensions["x-grest-template-allowed"]; ok {
if _, ok := template.(json.RawMessage); ok {
op.RequestBody.Value.Extensions["x-grest-template-allowed"] = strings.ToLower(
string(template.(json.RawMessage))) == "true"
}
// Final check
if allowed, ok := op.RequestBody.Value.Extensions["x-grest-template-allowed"].(bool); !ok {
log.Fatal(
"RequestBody Extension x-grest-template-allowed must be boolean on",
path, " ", method, " not ", reflect.TypeOf(template),
)
} else {
bodyAllowed = allowed
}
}
}
e.Add(method, convertPath(path), func(c echo.Context) error {
templateParams, queryParams := map[string]interface{}{}, map[string]interface{}{}
for _, param := range params {
switch param.In {
case "path":
queryParams[param.Name] = c.Param(param.Name)
if allowed, ok := param.Extensions["x-grest-template-allowed"]; ok && allowed.(bool) {
templateParams[param.Name] = c.Param(param.Name)
}
case "query":
queryParams[param.Name] = c.QueryParam(param.Name)
if allowed, ok := param.Extensions["x-grest-template-allowed"]; ok && allowed.(bool) {
templateParams[param.Name] = c.QueryParam(param.Name)
}
}
}
body := map[string]interface{}{}
if err := (&echo.DefaultBinder{}).BindBody(c, &body); err != nil {
log.Fatal(err)
return err
}
// Can't do nested in SQL
for key, val := range body {
queryParams[key] = val
}
if bodyAllowed {
templateParams["body"] = body
}
var username string
switch c.Get("username").(type) {
case string:
username = c.Get("username").(string)
default:
username = "anon"
}
results, err := api.runQuery(
username,
templates, templateParams, queryParams,
)
if err == nil {
return c.JSON(http.StatusOK, results)
}
return err
})
}
}
}
for _, req := range swagger.Security {
for provider, _ := range req {
securityScheme := swagger.Components.SecuritySchemes[provider].Value
switch securityScheme.Type {
case "http":
switch securityScheme.Scheme {
case "basic":
if err := json.Unmarshal(
securityScheme.Extensions["x-grest-password-query"].(json.RawMessage), &api.securityQueries); err != nil {
log.Fatal(
"Failed to parse x-grest-password-query at",
provider, " : ", err,
" ", string(securityScheme.Extensions["x-grest-password-query"].(json.RawMessage)),
)
}
api.addBasicAuth(e)
default:
log.Fatal("Unsupported http security scheme", securityScheme.Scheme)
}
default:
log.Fatal("Unsupported security type", securityScheme.Type)
}
}
}
return e
}
//// Core working code
func sanitize(params map[string]interface{}) error {
for k, v := range params {
switch v.(type) {
case string:
if !sqlSanitize.Match([]byte(k)) || !sqlSanitize.Match([]byte(v.(string))) {
return echo.NewHTTPError(
http.StatusBadRequest,
fmt.Sprintf("'%s' and '%s' must match /%s/", k, v, sanitizeRegex),
)
}
case map[string]interface{}:
if !sqlSanitize.Match([]byte(k)) {
return echo.NewHTTPError(
http.StatusBadRequest,
fmt.Sprintf("'%s' and '%s' must match /%s/", k, v, sanitizeRegex),
)
}
return sanitize(v.(map[string]interface{}))
}
}
return nil
}
func errorMapping(err error) error {
if pgerr, ok := err.(pgx.PgError); ok {
code, ok := map[string]int{
pgerrcode.UndefinedTable: http.StatusNotFound,
pgerrcode.InsufficientPrivilege: http.StatusForbidden,
pgerrcode.UndefinedObject: http.StatusNotFound,
}[pgerr.Code]
if !ok {
log.Println("Couldn't find error code", pgerr.Code)
code = http.StatusInternalServerError
}
return echo.NewHTTPError(code, err)
} else if pgerr, ok := err.(*pq.Error); ok {
code, ok := map[pq.ErrorCode]int{
pgerrcode.UndefinedTable: http.StatusNotFound,
pgerrcode.InsufficientPrivilege: http.StatusForbidden,
pgerrcode.UndefinedObject: http.StatusNotFound,
}[pgerr.Code]
if !ok {
log.Println("Couldn't find error code", pgerr.Code)
code = http.StatusInternalServerError
}
return echo.NewHTTPError(code, err)
} else if sqlite3err, ok := err.(sqlite3.Error); ok {
code, ok := map[sqlite3.ErrNo]int{
sqlite3.ErrError: http.StatusNotFound,
}[sqlite3err.Code]
if !ok {
log.Println("Couldn't find error code", sqlite3err.Code)
code = http.StatusInternalServerError
}
return echo.NewHTTPError(code, err)
}
log.Println("Error type not handled", reflect.TypeOf(err))
return echo.NewHTTPError(http.StatusInternalServerError, err)
}
func (api *API) runQuery(
username string, queryTemplates []*template.Template, templateParams map[string]interface{},
queryParams map[string]interface{}) ([]map[string]interface{}, error) {
if !sqlSanitize.Match([]byte(username)) {
log.Println("Using anon Role")
username = "anon"
}
var txn txInterface
{
var err error
txn, err = api.sql.Beginx()
if err != nil {
log.Println("Failed to open transaction", err)
return nil, echo.NewHTTPError(http.StatusInternalServerError, err)
}
}
if err := api.setUser(txn, username); err != nil {
log.Println("Failed to set role", err)
if err := txn.Rollback(); err != nil {
log.Fatal(err)
}
return nil, echo.NewHTTPError(http.StatusUnauthorized, err)
}
// Sanitize
if err := sanitize(templateParams); err != nil {
log.Println("Failed to sanitize params", err)
return nil, err
}
var rows rowsInterface
for i, queryTemplate := range queryTemplates {
var queryBuffer bytes.Buffer
if err := queryTemplate.Execute(&queryBuffer, templateParams); err != nil {
log.Println("Template failed", err)
return nil, err
}
log.Println(string(queryBuffer.Bytes()))
{
var err error
if i < len(queryTemplates)-1 {
_, err = txn.NamedExec(
string(queryBuffer.Bytes()),
queryParams,
)
} else {
rows, err = txn.NamedQuery(
string(queryBuffer.Bytes()),
queryParams,
)
}
if err != nil {
log.Println("Failed to run query", err)
if err := txn.Rollback(); err != nil {
log.Fatal(err)
}
return nil, errorMapping(err)
}
}
}
var results []map[string]interface{}
row := map[string]interface{}{}
for rows.Next() {
if err := rows.MapScan(row); err != nil {
log.Println("Failed to scan row", err)
if err := rows.Close(); err != nil {
log.Fatal(err)
}
return nil, echo.NewHTTPError(http.StatusInternalServerError, err)
}
results = append(results, row)
}
if err := rows.Err(); err != nil {
log.Println("Failed to fetch rows", err)
return nil, errorMapping(err)
}
if err := rows.Close(); err != nil {
log.Fatal(err)
}
if err := api.resetUser(txn); err != nil {
log.Println("Failed to reset role", err)
if err := txn.Rollback(); err != nil {
log.Fatal(err)
}
return nil, echo.NewHTTPError(http.StatusUnauthorized, err)
}
if err := txn.Commit(); err != nil {
log.Fatal(err)
}
return results, nil
}