github.com/insionng/yougam@v0.0.0-20170714101924-2bc18d833463/libraries/lib/pq/url.go (about)

     1  package pq
     2  
     3  import (
     4  	"fmt"
     5  	"net"
     6  	nurl "net/url"
     7  	"sort"
     8  	"strings"
     9  )
    10  
    11  // ParseURL no longer needs to be used by clients of this library since supplying a URL as a
    12  // connection string to sql.Open() is now supported:
    13  //
    14  //	sql.Open("postgres", "postgres://bob:secret@1.2.3.4:5432/mydb?sslmode=verify-full")
    15  //
    16  // It remains exported here for backwards-compatibility.
    17  //
    18  // ParseURL converts a url to a connection string for driver.Open.
    19  // Example:
    20  //
    21  //	"postgres://bob:secret@1.2.3.4:5432/mydb?sslmode=verify-full"
    22  //
    23  // converts to:
    24  //
    25  //	"user=bob password=secret host=1.2.3.4 port=5432 dbname=mydb sslmode=verify-full"
    26  //
    27  // A minimal example:
    28  //
    29  //	"postgres://"
    30  //
    31  // This will be blank, causing driver.Open to use all of the defaults
    32  func ParseURL(url string) (string, error) {
    33  	u, err := nurl.Parse(url)
    34  	if err != nil {
    35  		return "", err
    36  	}
    37  
    38  	if u.Scheme != "postgres" && u.Scheme != "postgresql" {
    39  		return "", fmt.Errorf("invalid connection protocol: %s", u.Scheme)
    40  	}
    41  
    42  	var kvs []string
    43  	escaper := strings.NewReplacer(` `, `\ `, `'`, `\'`, `\`, `\\`)
    44  	accrue := func(k, v string) {
    45  		if v != "" {
    46  			kvs = append(kvs, k+"="+escaper.Replace(v))
    47  		}
    48  	}
    49  
    50  	if u.User != nil {
    51  		v := u.User.Username()
    52  		accrue("user", v)
    53  
    54  		v, _ = u.User.Password()
    55  		accrue("password", v)
    56  	}
    57  
    58  	if host, port, err := net.SplitHostPort(u.Host); err != nil {
    59  		accrue("host", u.Host)
    60  	} else {
    61  		accrue("host", host)
    62  		accrue("port", port)
    63  	}
    64  
    65  	if u.Path != "" {
    66  		accrue("dbname", u.Path[1:])
    67  	}
    68  
    69  	q := u.Query()
    70  	for k := range q {
    71  		accrue(k, q.Get(k))
    72  	}
    73  
    74  	sort.Strings(kvs) // Makes testing easier (not a performance concern)
    75  	return strings.Join(kvs, " "), nil
    76  }