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feat: add Banking TUI shell using bubbletea

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Add an 80s-style green-on-black bank terminal shell ("banking") using
charmbracelet/bubbletea for full-screen TUI rendering over SSH.

Screens: login, main menu, account summary, account detail with
transactions, wire transfer wizard (6-step form capturing routing
number, destination, beneficiary, amount, memo, auth code), transaction
history with pagination, secure messages with breadcrumb content (fake
internal IPs, vault codes), change PIN, and hidden admin access (99)
that locks after 3 failed attempts with COBOL-style error output.

All key actions (login, navigation, wire transfers, admin attempts) are
logged to the session store. Wire transfer data is the honeypot gold.

Configurable via [shell.banking] in TOML: bank_name, terminal_id, region.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Torjus Håkestad
2026-02-14 23:17:12 +01:00
parent 462c44ce89
commit 8ff029fcb7
18 changed files with 2466 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

194
internal/shell/banking/screen_transfer.go Normal file
View File

@@ -0,0 +1,194 @@
package banking
import (
"fmt"
"strings"
tea "github.com/charmbracelet/bubbletea"
)
const (
transferStepRouting = iota
transferStepDest
transferStepBeneficiary
transferStepBankName
transferStepAmount
transferStepMemo
transferStepConfirm
transferStepAuthCode
transferStepComplete
)
var transferPrompts = []string{
" ROUTING NUMBER (ABA): ",
" DESTINATION ACCOUNT: ",
" BENEFICIARY NAME: ",
" RECEIVING BANK NAME: ",
" AMOUNT (USD): ",
" MEMO / REFERENCE: ",
"",
" AUTHORIZATION CODE: ",
}
type transferModel struct {
step int
fields [8]string // indexed by step
transfer WireTransfer
confirm string // y/n input for confirm step
}
func newTransferModel() transferModel {
return transferModel{}
}
func (m transferModel) Update(msg tea.Msg) (transferModel, tea.Cmd) {
keyMsg, ok := msg.(tea.KeyMsg)
if !ok {
return m, nil
}
if m.step == transferStepComplete {
return m, nil
}
if m.step == transferStepConfirm {
switch keyMsg.Type {
case tea.KeyEnter:
switch strings.ToUpper(m.confirm) {
case "Y", "YES":
m.step = transferStepAuthCode
case "N", "NO":
m.confirm = "cancelled"
}
return m, nil
case tea.KeyBackspace:
if len(m.confirm) > 0 {
m.confirm = m.confirm[:len(m.confirm)-1]
}
default:
ch := keyMsg.String()
if len(ch) == 1 && ch[0] >= 32 && ch[0] < 127 && len(m.confirm) < 3 {
m.confirm += ch
}
}
return m, nil
}
switch keyMsg.Type {
case tea.KeyEnter:
val := strings.TrimSpace(m.fields[m.step])
if val == "" {
return m, nil
}
if m.step == transferStepAuthCode {
m.transfer.AuthCode = val
m.step = transferStepComplete
return m, nil
}
switch m.step {
case transferStepRouting:
m.transfer.RoutingNumber = val
case transferStepDest:
m.transfer.DestAccount = val
case transferStepBeneficiary:
m.transfer.Beneficiary = val
case transferStepBankName:
m.transfer.BankName = val
case transferStepAmount:
m.transfer.Amount = val
case transferStepMemo:
m.transfer.Memo = val
}
m.step++
return m, nil
case tea.KeyBackspace:
if len(m.fields[m.step]) > 0 {
m.fields[m.step] = m.fields[m.step][:len(m.fields[m.step])-1]
}
default:
ch := keyMsg.String()
if len(ch) == 1 && ch[0] >= 32 && ch[0] < 127 && len(m.fields[m.step]) < 40 {
m.fields[m.step] += ch
}
}
return m, nil
}
func (m transferModel) View() string {
var b strings.Builder
b.WriteString("\n")
b.WriteString(centerText("WIRE TRANSFER"))
b.WriteString("\n\n")
b.WriteString(thinDivider())
b.WriteString("\n\n")
// Show completed fields.
for i := 0; i < m.step && i < len(transferPrompts); i++ {
if i == transferStepConfirm {
continue
}
prompt := transferPrompts[i]
if prompt == "" {
continue
}
b.WriteString(baseStyle.Render(prompt))
b.WriteString(baseStyle.Render(m.fields[i]))
b.WriteString("\n")
}
// Current field.
switch {
case m.step == transferStepConfirm:
b.WriteString("\n")
b.WriteString(titleStyle.Render(" === TRANSFER SUMMARY ==="))
b.WriteString("\n\n")
b.WriteString(baseStyle.Render(fmt.Sprintf(" ROUTING: %s", m.transfer.RoutingNumber)))
b.WriteString("\n")
b.WriteString(baseStyle.Render(fmt.Sprintf(" ACCOUNT: %s", m.transfer.DestAccount)))
b.WriteString("\n")
b.WriteString(baseStyle.Render(fmt.Sprintf(" BENEFICIARY: %s", m.transfer.Beneficiary)))
b.WriteString("\n")
b.WriteString(baseStyle.Render(fmt.Sprintf(" BANK: %s", m.transfer.BankName)))
b.WriteString("\n")
b.WriteString(baseStyle.Render(fmt.Sprintf(" AMOUNT: $%s", m.transfer.Amount)))
b.WriteString("\n")
b.WriteString(baseStyle.Render(fmt.Sprintf(" MEMO: %s", m.transfer.Memo)))
b.WriteString("\n\n")
b.WriteString(titleStyle.Render(" CONFIRM TRANSFER? (Y/N): "))
b.WriteString(inputStyle.Render(m.confirm))
b.WriteString(inputStyle.Render("_"))
b.WriteString("\n")
case m.step == transferStepComplete:
b.WriteString("\n")
b.WriteString(thinDivider())
b.WriteString("\n\n")
b.WriteString(titleStyle.Render(" TRANSFER QUEUED FOR PROCESSING"))
b.WriteString("\n\n")
b.WriteString(baseStyle.Render(fmt.Sprintf(" CONFIRMATION #: WR-%s-%s",
m.transfer.RoutingNumber[:4], "847291")))
b.WriteString("\n")
b.WriteString(baseStyle.Render(" STATUS: PENDING FEDWIRE SETTLEMENT"))
b.WriteString("\n")
b.WriteString(baseStyle.Render(" ESTIMATED COMPLETION: NEXT BUSINESS DAY"))
b.WriteString("\n\n")
b.WriteString(dimStyle.Render(" PRESS ANY KEY TO RETURN TO MAIN MENU"))
b.WriteString("\n")
case m.step < len(transferPrompts):
prompt := transferPrompts[m.step]
b.WriteString(titleStyle.Render(prompt))
b.WriteString(inputStyle.Render(m.fields[m.step]))
b.WriteString(inputStyle.Render("_"))
b.WriteString("\n")
}
if m.step < transferStepConfirm {
b.WriteString("\n")
b.WriteString(thinDivider())
b.WriteString("\n\n")
b.WriteString(dimStyle.Render(fmt.Sprintf(" STEP %d OF 6", m.step+1)))
b.WriteString("\n")
}
return b.String()
}