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select.go
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select.go
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package bartlett
import (
"fmt"
sqrl "github.com/Masterminds/squirrel"
"net/http"
"strconv"
"strings"
)
func (b Bartlett) buildSelect(t Table, r *http.Request) (sqrl.SelectBuilder, error) {
query := selectColumns(t, r).From(t.Name)
query = selectWhere(query, t, r)
query = selectOrder(query, t, r)
query = selectLimit(query, r)
if t.UserID != `` {
userID, err := b.Users(r)
if err != nil {
return query, err
}
query = query.Where(sqrl.Eq{t.UserID: userID})
}
return query, nil
}
type orderSpec struct {
Column string
Direction string
}
func selectOrder(query sqrl.SelectBuilder, t Table, r *http.Request) sqrl.SelectBuilder {
for _, col := range parseOrder(t, r) {
query = query.OrderBy(fmt.Sprintf(`%s %s`, col.Column, strings.ToUpper(col.Direction)))
}
return query
}
func parseOrder(t Table, r *http.Request) []orderSpec {
var out []orderSpec
if len(r.URL.Query()[`order`]) > 0 {
orderCols := strings.Split(r.URL.Query()[`order`][0], `,`)
order := orderSpec{}
for _, col := range orderCols {
order.Direction = `desc`
if strings.Contains(col, `.`) {
pair := strings.Split(col, `.`)
order.Column = pair[0]
if strings.ToLower(pair[1]) == `asc` {
order.Direction = `asc`
}
} else {
order.Column = col
}
if sliceContains(t.columns, order.Column) {
out = append(out, order) // Omit anything not in the table spec
}
}
}
return out
}
func selectColumns(t Table, r *http.Request) sqrl.SelectBuilder {
var query sqrl.SelectBuilder
columns := parseColumns(t, r)
if len(columns) > 0 {
query = sqrl.Select(columns[0])
query = query.Columns(columns[1:]...)
} else {
query = sqrl.Select(`*`)
}
return query
}
func parseColumns(t Table, r *http.Request) []string {
var out []string
if len(r.URL.Query()[`select`]) > 0 {
requestColumns := strings.Split(r.URL.Query()[`select`][0], `,`) // Get the first `select` var and forget about any others.
out = t.validReadColumns(requestColumns)
}
return out
}
func selectLimit(query sqrl.SelectBuilder, r *http.Request) sqrl.SelectBuilder {
var (
err error
limit int
offset int
)
if len(r.URL.Query()[`limit`]) > 0 {
limit, err = strconv.Atoi(r.URL.Query()[`limit`][0])
if err != nil || limit < 0 {
limit = 0
}
}
if limit > 0 && len(r.URL.Query()[`offset`]) > 0 {
offset, err = strconv.Atoi(r.URL.Query()[`offset`][0])
if err != nil || offset < 0 {
offset = 0
}
}
if limit > 0 {
query = query.Limit(uint64(limit)).Offset(uint64(offset))
}
return query
}
func selectWhere(query sqrl.SelectBuilder, t Table, r *http.Request) sqrl.SelectBuilder {
i := 0
columns := make([]string, len(r.URL.Query()))
for k := range r.URL.Query() {
columns[i] = k
i++
}
columns = t.validReadColumns(columns)
for column, values := range r.URL.Query() {
if sliceContains(columns, column) {
for _, rawCond := range values {
parsedCond, val := parseSimpleWhereCond(rawCond)
var cond string
if parsedCond == `in` || parsedCond == `not.in` {
if cond == `not.in` {
query = query.Where(sqrl.NotEq{column: whereIn(val)})
} else {
query = query.Where(sqrl.Eq{column: whereIn(val)})
}
} else {
cond = urlToWhereCond(column, parsedCond)
sqlCond, val := rectifyArg(cond, val)
query = query.Where(sqlCond, val)
}
}
}
}
return query
}
func sliceContains(haystack []string, needle string) bool {
for _, s := range haystack {
if needle == s {
return true
}
}
return false
}