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package main
import (
"database/sql"
"fmt"
"log"
"net/http"
"strings"
)
func showCreate(con *Context) {
if con.r.Method == "POST" {
addCreate(con)
return
}
if con.r.Method != "GET" {
con.w.WriteHeader(http.StatusMethodNotAllowed)
con.w.Write([]byte("method is not supported"))
return
}
if !con.CanEdit {
con.w.WriteHeader(http.StatusForbidden)
con.w.Write([]byte("no permission to change data"))
return
}
con.Content = map[string]any{}
primitives := []struct {
name string
query string
}{
{"commands", "select id, name, updated, command, message from commands order by name"},
{"checkers", "select id, name, description from checkers order by name"},
{"notifier", "select id, name, settings from notifier order by name"},
{"nodes", "select id, name, updated, message from nodes order by name"},
}
for _, prim := range primitives {
rows, err := DB.Query(prim.query)
defer rows.Close()
if err != nil {
log.Printf("could not get commands: %s", err)
con.Error = "could not get commands"
returnError(http.StatusInternalServerError, con, con.w)
return
}
result, err := rowsToResult(rows)
if err != nil {
log.Printf("could not get %s: %s", prim.name, err)
con.Error = "could not get " + prim.name
returnError(http.StatusInternalServerError, con, con.w)
return
}
con.Content[prim.name] = result
}
con.w.Header()["Content-Type"] = []string{"text/html"}
con.Render("create_index")
return
}
type (
sqlResult struct {
Columns []string
Rows [][]sql.NullString
}
)
func rowsToResult(rows *sql.Rows) (*sqlResult, error) {
res := &sqlResult{}
cols, err := rows.Columns()
if err != nil {
return res, fmt.Errorf("could not get columns: %w", err)
}
res.Columns = cols
res.Rows = [][]sql.NullString{}
colNum := len(cols)
for rows.Next() {
line := make([]sql.NullString, colNum)
lineMap := make([]any, colNum)
for i := 0; i < colNum; i++ {
lineMap[i] = &(line[i])
}
if err := rows.Scan(lineMap...); err != nil {
return res, fmt.Errorf("could not scan values: %w", err)
}
res.Rows = append(res.Rows, line)
}
return res, nil
}
func addCreate(con *Context) {
if !con.CanEdit {
con.w.WriteHeader(http.StatusForbidden)
con.w.Write([]byte("no permission to change data"))
return
}
if err := con.r.ParseForm(); err != nil {
con.w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(con.w, "could not parse parameters: %s", err)
return
}
con.w.Header()["Location"] = []string{"/create"}
addType := con.r.PostForm.Get("type")
types := map[string]struct {
Fields []string
Table string
}{
"command": {[]string{"name", "command", "message"}, "commands"},
"node": {[]string{"name", "message"}, "nodes"},
"checker": {[]string{"name", "description"}, "checkers"},
"notifier": {[]string{"name", "settings"}, "notifier"},
"check": {[]string{"name", "message", "options", "intval", "node_id", "command_id", "checker_id"}, "checks"},
}
t, found := types[addType]
if !found {
con.Error = "undefined type '" + addType + "'"
returnError(http.StatusBadRequest, con, con.w)
return
}
fields := make([]any, len(t.Fields))
vals := make([]string, len(t.Fields))
for i := 0; i < len(fields); i++ {
vals[i] = fmt.Sprintf(`$%d`, i+1)
fields[i] = con.r.PostForm.Get(t.Fields[i])
if fields[i] == "" {
con.Error = "field " + t.Fields[i] + " must not be empty"
returnError(http.StatusBadRequest, con, con.w)
return
}
}
stmt := `insert into ` + t.Table + `(` + strings.Join(t.Fields, ",") + `) values (` + strings.Join(vals, ",") + `)`
_, err := DB.Exec(stmt, fields...)
if err != nil {
log.Printf("could not insert new %s: %s", addType, err)
con.Error = "could not insert new " + addType
returnError(http.StatusInternalServerError, con, con.w)
return
}
con.w.WriteHeader(http.StatusSeeOther)
return
}
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